Public NTP Primary (stratum 1) Time Servers

A continuación se mostrará la lista de servidores NTP (Network Time Protocol) públicos de stratum 1

Estan clasificados en dos tipos basicamente (Por nivel de precision):

  • Stratum 1: sincronizan con fuentes de tiempo externas (relojes atómicos o radio-antenas).
  • Stratum 2: sincronizan con los Stratum 1.
  • Stratum n: Sincronizan con Stratum n-1 (siendo “n” 3 en el caso de sincronizar con un Stratum 2).

  1. AU ntp0.coreng.com.au (203.60.1.2)

    Location: Corinthian Engineering P/L, Sydney Australia.

    Geographic Coordinates: 33:50S 151:09E

    Synchronization: NTP V4 primary (Trimble Acutime GPS+PPS), i386/FreeBSD 4.8-STABLE.

    Service area: Australia.

    Access policy: open access to Australian organisations, please limit to two peer hosts per site.

    Note: Use DNS ntp0.coreng.com.au as IP address is likely to change.

    Contact: Richard Perini ([email protected])

  2. AU ntp0.cs.mu.OZ.AU (128.250.36.2)

    Location: The University of Melbourne, Melbourne, Australia

    Geographic Coordinates: 37:48:09.60S 144:57:29.50E

    Synchronization: NTP V4 primary (Trimble Acutime GPS), i386/NetBSD 1.6

    Service area: Australia, New Zealand, Pacific Region

    Access policy: open access, please limit to two peer hosts per site

    Note: service previously available at 128.250.37.1 moved to 128.250.37.2

    Contact: David Hornsby ([email protected])

  3. AU ntp1.cs.mu.OZ.AU (128.250.36.3)

    Location: The University of Melbourne, Melbourne, Australia

    Geographic Coordinates: 37:48:09.60S 144:57:29.50E

    Synchronization: NTP V4 primary (Magellan OEM GPS), i386/NetBSD 1.6

    Service area: Australia, New Zealand, Pacific Region

    Access policy: open access, please limit to two peer hosts per site

    Contact: David Hornsby ([email protected])

  4. BR ntp1.rnp.br (200.19.119.69)

    Location: Brazilian Research Network/Rede Nacional de Pesquisa (RNP)

    Geographic Coordinates: 15=B0 48.275963′ S, 47=B0 52.904663′ N, 1101.146m (WGS-84)

    Synchronization: NTP V4 Primary (Trimble Palisade GPS), FreeBSD/Unix

    Service Area: Brazil

    Access Policy: Open access to stratum 1, stratum 2 within Brazilian Research Network (RNP). Others by prior arrangement only.

    Contact: [email protected]

  5. BR ntps1.pads.ufrj.br (146.164.48.5 / 3ffe:2b00:100:10d:100::5) (CNAME ntp-s1.pads.ufrj.br)

    Location: Laboratory for the Processing of Analog and Digital Signals (PADS), Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.

    Geographic Coordinates: Lat: 22°51.7031’S. Lon: 043°13.7045’W. Alt: 25m.

    Synchronization: NTP V4 Primary (Garmin Etrex GPS with RA-46 system and 1 PPS external stabilized oscillator), PC/Linux with nanokernel.

    Service Area: Brazil, Latin America and Caribbean.

    Access Policy: Open access, please limit to two peer hosts (preferentially stratum 2 servers) per domain. Clients (end-users) should use only stratum 2 servers for synchronization.

    Contact: Rafael Jorge Csura Szendrodi ([email protected]).

    Note: IP addresses (IPv4 and IPv6) are subject to change, please use DNS instead!

  6. CA clock.uregina.ca (142.3.100.2)

    Location: University of Regina, Regina, Saskatchewan, Canada

    Geographic Coordinates: 50:25N , 104:35W

    Synchronization: NTP V4 Primary (GPS clock), PC/FreeBSD

    Service Area: SASK#net, CA*net, Canada

    Access Policy: open to stratum2 time servers, others by arrangement.

    Contact: Mark Haidl ([email protected])

    Note: for reliable access please notify with IP of your server

  7. CA subitaneous.cpsc.ucalgary.ca (136.159.2.254)

    Organization: Department of Computer Science, University of Calgary

    Location: Calgary, Alberta, Canada

    Geographic Coordinates: Latitude: 51.0801 Longitude: -114.1281

    Synchronization: NTP V4 Primary (GPS clock), UltraSparc/Solaris

    Service Area: North America

    Access Policy: Open to stratum 2 time servers, others by arrangement. Please notify us.

    Contact: Shaun Laing ([email protected])

    Note: The IP address is subject to change so please use DNS.

  8. CA tick.usask.ca (128.233.3.100)

    Location: University oc Saskatchewan, Saskatoon, Saskatchewan, SK, Canada

    Geographic Coordinates: 52:08:01N,106:38:11W

    Synchronization: NTP V3 Primary (GOES clock), DEC Mips/Unix

    Service Area: SASK#net, CA*net, Canada

    Access Policy: open access, prior arrangment required

    Contact: Alfred Hovdestad ([email protected])

    Note: priority given to local regional sites

    Note: tick.usask.ca and tock.usask.ca share a single GOES receiver

  9. CA tock.usask.ca (128.233.3.101)

    Location: University oc Saskatchewan, Saskatoon, Saskatchewan, SK, Canada

    Geographic Coordinates: 52:08:01N,106:38:11W

    Synchronization: NTP V3 Primary (GOES clock), DEC Mips/Unix

    Service Area: SASK#net, CA*net, Canada

    Access Policy: open access, prior arrangment required

    Contact: Alfred Hovdestad ([email protected])

    Note: priority given to local regional sites

    Note: tick.usask.ca and tock.usask.ca share a single GOES receiver

  10. CH ntp.metas.ch (193.5.216.14)

    Location: Federal Office of Metrology and Accreditation Switzerland (METAS), Bern, Switzerland

    Geographic Coordinates: N 46:55:25 E 07:27:51

    Synchronization: radiosynchronized receiver locked to HBG transmitter and ACTS dial-up link to METAS T&lab UTC(CH)

    Service Area: Switzerland, others by arrangement

    Access Policy: open access, please send a message to notify

    Note: the IP address may change, please use DNS

    Contact: Laurent-Guy Bernier ([email protected])

  11. CH swisstime.ethz.ch (129.132.2.21)

    Location: Integrated Systems Laboratory, Swiss Fed. Inst. of Technology, CH 8092 Zurich, Switzerland

    Geographic Coordinates: 47:23N, 8:32E

    Synchronization: NTP primary (DCF77 clock), Sun-4/SunOS 4.1.4

    Service Area: Switzerland/Europe

    Access Policy: open access

    Contact: Christoph Wicki ([email protected])

  12. CL ntp.dgf.uchile.cl (146.83.8.200)

    Location: Dpto. Geofísica, Universidad de Chile. Santiago, Chile.

    Geographic Coordinates: Lat: 33° 27.19’S. Lon: 70° 39.70’W. Alt: 533m.

    Synchronization: NTP V3 primary (GOES OM/DC-468 clock), SunSparc10/SunOS 4.1.3.

    Service area: REUNA and interconnected networks, Chile.

    Access Policy: open access, please send a message to notify.

    Contact: Gonzalo Pérez ([email protected])

    Note: ntp is an alias and the IP address may change; please use DNS.

  13. CL ntp.shoa.cl (200.54.149.19)

    location: Servicio Hidrografico y Oceanografico de la Armada de Chile

    Geographic coordinates: 33:01,6958S 71:38,1136W (WGS-84)

    Synchronization: NTP V4 primary (GPS Clock), i386 Redhat Linux

    Service Area: Chile

    Access Policy: open access

    contact: Raul Vergara ([email protected])

  14. CZ ntp.cesnet.cz (195.113.144.201)

    Location:  CESNETPrague, The Czech Republic

    Geographic Coordinates:  50° 6.11′ N, 14° 23.49′ E, +252 m

    Synchronization: NTP V4 primary (Garmin GPS35), PC / Linux with nanokernel

    Service Area:  Czech Republic and Slovakia, European academic community

    Access Policy: open to servers providing synchronization to ten or more hosts, others by arrangement

    Contact: Vladimir Smotlacha ([email protected])

    Note: ntp is an alias and the IP address may change; please use DNS.

  15. DE ntp0.fau.de (131.188.3.220)

    Location: University Erlangen-Nuernberg, D-91058 Erlangen, FRG

    Geographic Coordinates: 49.573N 11.028E (from Meinberg GPS 166)

    Synchronization: NTP V3 primary (GPS receiver (<<1us)), Sun SS10/Unix SunOS 5.6

    Service Area: Germany/Europe

    Access Policy: open access, pick one of ntp{0,1,2,3}.fau.de

    Contact: The Timekeepers ([email protected]) Note: IP addresses are subject to change; please use DNS

  16. DE ntp1.fau.de (131.188.3.221)

    Location: University Erlangen-Nuernberg, D-91058 Erlangen, FRG

    Geographic Coordinates: 49.573N 11.028E (from Meinberg GPS 166)

    Synchronization: NTP V3 primary (DCF77 PZF receiver (<50us)), Sun SS10 SunOS 5.6

    Service Area: Germany/Europe

    Access Policy: open access, pick one of ntp{0,1,2,3}.fau.de

    Contact: The Timekeepers ([email protected])

    Note: IP addresses are subject to change; please use DNS

  17. DE ntp2.fau.de (131.188.3.222)

    Location: University Erlangen-Nuernberg, D-91058 Erlangen, FRG

    Geographic Coordinates: 49.573N 11.028E (from Meinberg GPS 166)

    Synchronization: NTP V3 primary (GPS receiver (<<1us)), Sun SS10/SunOS 5.6

    Service Area: Germany/Europe

    Access Policy: open access, pick one of ntp{0,1,2,3}.fau.de

    Contact: The Timekeepers ([email protected])

    Note: IP addresses are subject to change; please use DNS

  18. DE ntp3.fau.de (131.188.3.223)

    Location: University Erlangen-Nuernberg, D-91058 Erlangen, FRG

    Geographic Coordinates: 49.573N 11.028E (from Meinberg GPS 166)

    Synchronization: NTP V3 primary (DCF77 PZF receiver (<50us)), Sun SS10/SunOS 5.6

    Service Area: Germany/Europe

    Access Policy: open access, pick one of ntp{0,1,2,3}.fau.de

    Contact: The Timekeepers ([email protected])

    Note: IP addresses are subject to change; please use DNS

  19. DE ntps1-0.cs.tu-berlin.de (130.149.17.21)

    Location: Technische Universitaet Berlin, D-10587 Berlin, FRG

    Geographic Coordinates: 52.518N 13.326E

    Synchronization: NTP V3 primary (Meinberg GPS 166), Sun 4/65 SunOS4.1.3

    Service Area: Germany/Europe

    Access Policy: open access

    Contact: Gerard Gschwind ([email protected])

  20. DE ntps1-1.cs.tu-berlin.de (130.149.17.8)

    Location: Technische Universitaet Berlin, D-10587 Berlin, FRG

    Geographic Coordinates: 52.518N 13.326E

    Synchronization: NTP V3 primary (Meinberg GPS 166), SunS10-402 SunOS5.4

    Service Area: Germany/Europe

    Access Policy: open access

    Contact: Gerard Gschwind ([email protected])

  21. DE ptbtime1.ptb.de (192.53.103.103)

    Location: Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany

    Synchronization: NTP V3 primary (Primary standards CS1, CS2), HP9000/744/HP-UX

    Service Area: Germany/Europe, others by arrangement

    Access Policy: open access, please send a message to notify.

    Contact: Dieter Sibold, Ronald Scheffler ([email protected])0

    Note: ptbtime1.ptb.de is an alias and the IP address may change; please use DNS.

  22. DE ptbtime2.ptb.de (192.53.103.104)

    Location: Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany

    Synchronization: NTP V3 primary (PTB’s primary standards CS1, CS2), HP9000/744/HP-UX

    Service Area: Germany/Europe, others by arrangement

    Access Policy: open access, please send a message to notify.

    Contact: Dieter Sibold, Ronald Scheffler ([email protected])

    Note: ptbtime2.ptb.de is an alias and the IP address may change; please use DNS.

  23. DE rustime01.rus.uni-stuttgart.de (129.69.1.153)

    Location: Computer Center University of Stuttgart, D-70550 Stuttgart, Germany

    Geographic Coordinates: 48:47N, 9:10E

    Synchronization: NTP V3 primary (Meinberg DCF-77 PZF 535/TCXO), IBM RS6000-250, AIX 4.x

    Service Area: Germany/Europe

    Access Policy: open, preferred for stratum-2 servers providing synchronization to local networks; appreciate email notification

    Contact: Walter Wehinger ([email protected])

  24. DK Denmark GPS.FreeBSD.dk (212.242.86.186)

    Location: Slagelse, Denmark

    Geographic Coordinates: 55:24:22.03N, 11:20:22.98E

    Synchronization: NTP V4 GPS with rubidium timebase

    Service Area: As network paths make it sensible

    Access Policy: open access to servers, please, no client use

    Contacts: Poul-Henning Kamp ([email protected])

    Note: timestamps better than +/-50 nsec

  25. DK Denmark GPS.dix.dk (192.38.7.240)

    Location: Lyngby, Denmark

    Geographic Coordinates: 55:47:03.36N, 12:03:21.48E

    Synchronization: NTP V4 GPS with OCXO timebase

    Service Area: Networks BGP-announced on the DIX

    Access Policy: open access to servers, please, no client use

    Contacts: Poul-Henning Kamp ([email protected])

    Note: timestamps better than +/-5 usec.

  26. FR canon.inria.fr (192.93.2.20)

    Location: INRIA, Rocquencourt (near Paris), France

    Synchronization: NTP V3 primary (GPS), Datum TymServe 2100L

    Service Area: France/Europe

    Access Policy: open access, please send a message to notify

    Contact: [email protected]

    Note: We use a Datel RCH208 clock with SER024 V24 interface.

  27. FR chronos.cru.fr

    Location: University of Rennes 1, Britany, France

    Synchronization: NTP V3, Datum TymServe 2100L with GPS

    Service Area: France/Europe

    Access Policy: open access to stratum-2 servers, send a message to notify

    Contact: [email protected]

    Note: use DNS for IP address

  28. FR ntp-p1.obspm.fr

    Location: BNM-SYRTE, Observatoire de Paris, Paris, France

    Synchronization: NTP V3, Datum TymServe 2100 with 1PPS

    Service Area: France/Europe

    Access Policy: open access to stratum-2 servers, but please send a message to notify

    Contact: [email protected], More Informations?

    Note: Ref: 1PPS from Atomic Clock

  29. FR ntp-sop.inria.fr (138.96.64.10)

    Location: INRIA, Sophia Antipolis (French Riviera, near Nice), France

    Synchronization: NTP V3 primary (GPS), PC/Linux

    Service Area: RENATER, R3T2, France/Europe

    Access Policy: open to servers providing synchronization to reasonnable size networks (>10 hosts).

    Contact: [email protected], More help?

    Note: We use a MC2 Starsync GPS EISA card

  30. FR ntp1.curie.fr

    Location: Institut Curie, Section de Recherche, Paris, France.

    Synchronization: Coetanian TSS100 NTP V3 GPS

    Service area: all areas.

    Access policy: Universities, academic research centers, non-profit org ONLY.

    Contact: [email protected]

    Note: use DNS for IP address

  31. FR ntp2.curie.fr

    Location: Institut Curie, Section de Recherche, Paris, France.

    Synchronization: Datum 2100L NTP V3 GPS

    Service area: all areas.

    Access policy: Universities, academic research centers, non-profit org ONLY.

    Contact: [email protected]

    Note: use DNS for IP address

  32. FR ntp3.curie.fr

    Location: Institut Curie, Section de Recherche, Paris, France.

    Synchronization: Truetime NTS100 GPS

    Service area: France/Europe.

    Access policy: Universities, academic research centers, non-profit org ONLY.

    Contact: [email protected]

    Note: use DNS for IP address

  33. HK clock.cuhk.edu.hk

    Location: The Chinese University of Hong Kong.

    Geographic Coordinates: 22:25:10N,114:12:22E

    Synchronization: NTP V3 Primary (TSS-100 GPS clock)

    Service Area: Hong Kong, China and South East Asia

    Access Policy: open access

    Contact: Connie Law ([email protected]), KM Fung ([email protected]) Note: IP addresses are subject to change; please use DNS

  34. IE ntp-galway.hea.net

    Location: Dept. of Information Technology, National University of Ireland, Galway, Ireland

    Synchronization: NTPV4 primary (Trimble Acutime GPS), Intel, Linux 6.2

    Service Area: Ireland, UK

    Access Policy: open access, please send a message to notify

    Contact: [email protected]

    Note: IP address is subject to change so please use DNS.

  35. IT ntp1.ien.it (193.204.114.232)

    Location: IEN Galileo Ferraris, Torino, Italy

    Synchronization: NTP primary (Cesium Beam Frequency Standard), PC/Linux

    Service Area: Italy/Europe

    Access Policy: open access, pick one of ntp{1,2}.ien.it; please send a message to notify

    Contact: [email protected]

    Note: IP addresses are subject to change; please use DNS

  36. IT ntp2.ien.it (193.204.114.233)

    Location: IEN Galileo Ferraris, Torino, Italy

    Synchronization: NTP primary (Cesium Beam Frequency Standard), PC/Linux

    Service Area: Italy/Europe

    Access Policy: open access, pick one of ntp{1,2}.ien.it; please send a message to notify

    Contact: [email protected]

    Note: IP addresses are subject to change; please use DNS

  37. IT tempo.cstv.to.cnr.it (150.145.33.1)

    Location: CSTV of National Research Council, Torino, Italy

    Geographic Coordinates: 45:00:54N, 7:38:20.7E, 306.6H

    Syncronization: NTP V3 primary (IEN CTD clock), DecSystem 5500/Ultrix 4.4

    Service Area: Italy/Europe

    Access Policy: open access

    Contact: Fabrizio Pollastri ([email protected])

    Note: information at http://www.cstv.to.cnr.it/toi

  38. JP clock.nc.fukuoka-u.ac.jp (133.100.9.2)

    Location: Fukuoka university, Fukuoka, Japan

    Geographic Coodinates: 130:21.81E, 33:32.87N

    Synchronization: NTP V3.3 primary (GPS clock), Heliostation 400/SunOS 4.1.3

    Service Area: Japan/Pacific area

    Access Policy: open access

    Contact: TSURUOKA Tomoaki ([email protected]), YOSHIMURA Kenji ([email protected])

    Note: We use a TRAK 8810 GPS STATION CLOCK and a Furuno Electric Co.’s GN-72 GPS receiver respectively.

  39. JP clock.tl.fukuoka-u.ac.jp (133.100.11.8)

    Location: Fukuoka university, Fukuoka, Japan

    Geographic Coodinates: 130:21.81E, 33:32.87N

    Synchronization: NTP V3.3 primary (GPS clock), Heliostation 400/SunOS 4.1.3

    Service Area: Japan/Pacific area

    Access Policy: open access

    Contact: TSURUOKA Tomoaki ([email protected]), YOSHIMURA Kenji ([email protected])

    Note: We use a TRAK 8810 GPS STATION CLOCK and a Furuno Electric Co.’s GN-72 GPS receiver respectively.

  40. MX cronos.cenam.mx

    Location: Centro Nacional de Metrologia, Queretaro, Mexico

    Geographic coordinates: 20:32:9.6 N, 100:16:18 W, +1912

    Synchronization: Interlock algorithm with direct 1 pps from rimary

    frequency standard of CENAM, UTC(CENAM)

    Service Area: All Mexico and USA

    Access policy: Open access

    Contact: J. Mauricio Lopez R., [email protected] , 52 4 211 0543

  41. NL ntp0.nl.net (193.67.79.202)

    Location: NLnet, Amsterdam, The Netherlands

    Synchronization: NTP primary (GPS), Sun/Unix SunOS 4.1.3

    Service Area: The Netherlands/Europe

    Access Policy: open access

    Contact: [email protected]

  42. NL ntp1.nl.net (193.79.237.14)

    Location: NLnet, Amsterdam, The Netherlands

    Synchronization: NTP primary (GPS), Sun/Unix SunOS 4.1.3

    Service Area: The Netherlands/Europe

    Access Policy: open access

    Contact: [email protected]

  43. NL ntp2.nl.net (193.79.237.30)

    Location: NLnet, Amsterdam, The Netherlands

    Synchronization: NTP primary (GPS), Sun/Unix SunOS 4.1.3

    Service Area: The Netherlands/Europe

    Access Policy: open access

    Contact: [email protected]

  44. NO time.service.uit.no

    Location: The EDB Centre, University of Tromsoe, Norway

    Synchronization: NTP V3 primary (GPS clock), HP-UX/Unix

    Service Area: NORDUnet

    Access Policy: semi-open access, prior arrangment required

    Contact: ([email protected])

  45. NZ clock1.canterbury.ac.nz (132.181.10.44)

    Location: Computer Science
    Department, University of Canterbury

    Synchronization: NTP V4 primary (Trimble Palisade GPS), RedHat Linux

    Service Area: New Zealand

    ccess Policy: restricted to stratum-2 servers providing synchronization to
    local networks of ten or more hosts, by prior arrangement

    Contact: Pete Glassenbury ([email protected])

    Note: IP addresses are subject to change; please use DNS

  46. PL ntp.certum.pl (217.153.69.35)

    Location: Unizeto Sp. z o.o., ul. Krolowej Korony Polskiej 21, 70-486 Szczecin

    Geographic Coordinates: 53:26:15N 14:31:58E

    Synchronization: NTP V4 primary (Meinberg GPS 167/PPS), Linux

    Service Area: Poland/Europe

    Access Policy: open access

    Contact: Wojtek Slusarczyk ([email protected])

  47. PL vega.cbk.poznan.pl (150.254.183.15)

    Location: Astrogeodynamical Observatory, Space Research Centre, Borowiec, Poland

    Synchronization: NTP V3 primary (Caesium clock), PC Pentium, RedHat Linux

    Service Area: Poland/Europe

    Access Policy: open access

    Contact: Robert Diak ([email protected]), Jerzy Nawrocki ([email protected])

  48. SE ntp1.gbg.netnod.se (192.36.133.130)

    Location: Netnod Internet Exchange i Sverige AB, Stockholm, SWEDEN (Exchange point Gothenburg, Sweden)

    Synchronization: NTP V4 primary (UTC(SP) Swedish National Time Scale via GPS CV),FreeBSD

    Service Area: all areas

    Access Policy: open access

    Contact: Magnus Andersson; See also NTP time server statistics

  49. SE ntp2.gbg.netnod.se (192.36.133.66)

    Location: Netnod Internet Exchange i Sverige AB, Stockholm, SWEDEN (Exchange point Gothenburg, Sweden)

    Synchronization: NTP V4 primary (UTC(SP) Swedish National Time Scale via GPS CV), FreeBSD

    Service Area: all areas

    Access Policy: open access

    Contact: Magnus Andersson; See also NTP time server statistics

  50. SE ntp1.mmo.netnod.se (192.36.134.17)

    Location: Netnod Internet Exchange i Sverige AB, Stockholm, SWEDEN (Exchange point Malmoe, Sweden)

    Synchronization: NTP V4 primary (UTC(SP) Swedish National Time Scale via GPS CV), FreeBSD

    Service Area: all areas

    Access Policy: open access

    Contact: Magnus Andersson; See also NTP time server statistics

  51. SE ntp2.mmo.netnod.se (192.36.134.25)

    Location: Netnod Internet Exchange i Sverige AB, Stockholm, SWEDEN (Exchange point Malmoe, Sweden)

    Synchronization: NTP V4 primary (UTC(SP) Swedish National Time Scale via GPS CV), FreeBSD

    Service Area: all areas

    Access Policy: open access

    Contact: Magnus Andersson; See also NTP time server statistics

  52. SE ntp1.sp.se (62.119.40.98)

    Location: SP Swedish National Testing and Research Institute, BORAS, SWEDEN

    Synchronization: NTP V4 primary (UTC(SP) Swedish National Time Scale), FreeBSD

    Service Area: all areas

    Access Policy: open access

    Contact: Kenneth Jaldehag [email protected]; See also NTP time server statistics

  53. SE ntp2.sp.se (62.119.40.99)

    Location: SP Swedish National Testing and Research Institute, BORAS, SWEDEN

    Synchronization: NTP V4 primary (UTC(SP) Swedish National Time Scale), FreeBSD

    Service Area: all areas

    Access Policy: open access

    Contact: Kenneth Jaldehag [email protected]; See also NTP time server statistics

  54. SE ntp1.sth.netnod.se (192.36.144.22)

    Location: Netnod Internet Exchange i Sverige AB, Stockholm, SWEDEN (Exchange point Stockholm, Sweden)

    Synchronization: NTP V4 primary (UTC(SP) Swedish National Time Scale via GPS CV), FreeBSD

    Service Area: all areas

    Access Policy: open access

    Contact: Magnus Andersson; See also NTP time server statistics

  55. SE ntp2.sth.netnod.se (192.36.144.23)

    Location: Netnod Internet Exchange i Sverige AB, Stockholm, SWEDEN (Exchange point Stockholm, Sweden)

    Synchronization: NTP V4 primary (UTC(SP) Swedish National Time Scale via GPS CV), FreeBSD

    Service Area: all areas

    Access Policy: open access

    Contact: Magnus Andersson; See also NTP time server statistics

  56. SE time1.stupi.se (192.36.143.150)

    Location: Stupi AB, Stockholm, SWEDEN

    Synchronization: NTP V3 primary (Saphir Cesium Beam Standard/GPS), BSDI Unix

    Service Area: SUnet, NORDUnet

    Access Policy: open access

    Contact: Peter Lothberg ([email protected])

  57. SE time2.stupi.se (192.36.143.151)

    Location: Stupi AB, Stockholm, SWEDEN

    Synchronization: NTP V4 primary (HP5071, FreeBSD)

    Service Area: Europe

    Access Policy: open access

    Contact: [email protected] (Peter Lothberg)

  58. SG jamtepat.singnet.com.sg (165.21.110.7)

    Location: SingNet, Singapore

    Geographic Coordinates: 1.292N 103.808E (GPS WGS84)

    Synchronization: Datum Tymserve 2100-GPS

    Service Area: STIX/Asia (outside Singapore), others by arrangement

    Access Policy: port access granted by arrangement

    Contact: [email protected]

  59. SG nets.org.sg (203.117.180.36)

    Location: SPRING Singapore

    Synchronization: ACTS dial-up using lockclock algorithm; Compaq Alpha UNIX

    Service Area: Singapore and Asia

    Access Policy: Open to stratum-2 servers and others by arrangement

    Contact: Liu YanYing ([email protected]) 65-67739852

  60. SI goodtime.ijs.si (193.2.4.2)

    Location: J. Stefan Institute, Ljubljana, Slovenia

    Geographic Coordinates: 46° 2.517′ N, 14° 29.241′ E, +363 m (WGS84)

    Synchronization: NTP V4 primary (Trimble Palisade GPS), Compaq (DEC) Alpha / Tru64 Unix with MICRO_TIME kernel option

    Service Area: Slovenia, European academic community, others by arrangement

    Access Policy: restricted to servers providing synchronization to ten or more hosts, please send notification before regular use

    Contact: MarkMartinec ([email protected]); More info?

    Note: NTP V4 clients preferred for their lower load and better accuracy; IP address subject to change

  61. UK chronos.csr.net 194.35.252.7 (CNAME ntp.csr.net)

    Location: Computing Systems Research Ltd. United Kingdom

    Geographic Coordinates: 0:49:10W 52:14:54N (480578m 261841m)

    Synchronization: NTP V4 primary (Odetics GPS), Sun/Sparc Solaris 2.6

    Service Area: United Kingdom Western Europe

    Access Policy: open access

    Contact: C Buckingham ([email protected])

  62. UK ntp.my-inbox.co.uk (81.168.77.149)

    Location: Falmouth, Cornwall, UK

    Synchronisation: NTP V4.2.0 primary (MSF Radio Clock Receiver), Trustix Linux

    Service Area: United Kingdom

    Access Policy: open

    Contact: Phil Curnow [email protected]

  63. UK ntp2.ja.net (193.63.94.26)

    Location: University of London Computer Centre, UK

    Synchronization: NTP V3 primary (MSF clock), Sun/Unix

    Service Area: JANET

    Access Policy: closed access, see notes below.

    Contact: [email protected]

    Note: This server is part of the JANET NTP service and is available for JANET stratum-2 clients and for peering with external stratum-1 clocks. Any external stratum-1 peering requests should be emailed to the Contact address.

  64. US AK ntp.alaska.edu (199.165.76.11) (CNAME ntp-ua.usno.navy.mil)

    Location: University of Alaska, Fairbanks, AK (147 50 59.7W 64 51 27.3N WGS84)

    Synchronization: NTP V3 primary (GPS)

    Service area: Pacific Northwest, others by arrangement

    Access Policy: open access for stratum 2 servers

    Contact: Rich Schmidt, US Naval Observatory ([email protected])

  65. US CA clepsydra.dec.com (204.123.2.5)

    Location: HP Western Research Laboratory, Palo Alto, CA

    Synchronization: NTP V4 primary (GPS)

    Service Area: NSFNET, BARR region

    Access Policy: open access

    Contact: [email protected]

  66. US CA clock.isc.org (192.5.5.250)

    Location: Internet Software Consortium, Palo Alto, CA

    Geographic Coordinates: 122 9 41 W / 37 26 35 N

    Synchronization: NTP primary (GOES clock), BSD UNIX

    Service Area: BARRnet, Alternet-west, CIX-west

    Access Policy: open access

    Contact: Paul Vixie ([email protected])

  67. US CA clock.via.net (209.81.9.7)

    Location: ViaNet Communications, Palo Alto, CA, USA

    Synchronization: NTP V3 with Trimble Pasisade GPS receiver/FreeBSD

    Service Area: All areas

    Access Policy: open access

    Contact: Joe McGuckin ([email protected])

  68. US CA gpstime.trimble.com 206.40.88.30

    Location: Sunnyvale, CA US

    Synchronization: NTP primary (GPS clock), Trimble Palisade on Windows NT 4.0

    Service Area: Western US

    Access Policy: open access, stratum 3 or higher requested

    Contact: Sven Dietrich, [email protected] or [email protected]

  69. US CA montpelier.ilan.caltech.edu (192.12.19.20) CNAMES: montpelier.caltech.edu, ntp-caltech.usno.navy.mil

    Location: California Institute of Technology, Pasadena, CA

    Synchronization: NTP V3 primary (GPS clock)

    Service area: USA Pacific timezone, others by arrangement

    Access Policy: open access for stratum 2 servers

    Contacts: Rich Schmidt, US Naval Observatory ([email protected]),

    Heather Sherman, California Institute of Technology, ([email protected])

  70. US CA nist1.aol-ca.truetime.com (207.200.81.113)

    Location: AOL Time Warner facility, Sunnyvale, California

    Synchronizaton: Lockclock Algorithm and ACTS dial-up, GPS-stabilized oscillator for short-term stabilization

    Service Area: Western US

    Access Policy: Open access for up to 20 queries per hour (one-day average) from any one address, others by arrangment

    Contact: Judah Levine, [email protected], 303 492 7785

  71. US CA nist1.datum.com (66.243.43.21)

    Location: Datum Inc., Bancomm-Timing Division, San Jose, California

    Synchronization: ACTS dial-up using lockclock algorithm; DEC Alpha UNIX

    Service Area: Primarily networks in Western US

    Access Policy: Open to stratum-2 servers and others by arrangement.

    Contact: Judah Levine ([email protected]) 303 492-7785

  72. US CA nist1-sj.glassey.com (207.126.98.204)

    Location: Abovenet, San Jose, California

    Synchronization: ACTS dial-up using lockclock algorithm; DEC Alpha UNIX

    Service Area: Western US

    Access Policy: Open to stratum-2 servers and others by arrangement

    Contact: Judah Levine ([email protected]) 303 492-7785

  73. US CA ntp-cup.external.hp.com (192.6.38.127)

    Location: Cupertino CA (SF Bay area) 37:20N/122:00W

    Synchronization: NTPv3 primary, HP-UX/Palisade-GPS

    Service Area: West Coast USA

    Access Policy: open access

    Contact: [email protected]

    Note: no need to notify for access, go right ahead!

  74. US CA ntp.nasa.gov (198.123.30.132)

    Location: NASA Ames Research Center, Moffett Field, CA

    Synchronization: NTP V3 primary GPS Clock

    Service Area: NSFNET, BARR region, NASA NSN, DOE ESNET, DDN

    Access Policy: prior permission required

    Contact: [email protected]

  75. US CA tick.gpsclock.com (206.203.0.15)

    Location: GPSClock.com headquarters, Redondo Beach, CA

    Geographic Coordinates: 33:50:26.510N, 118:22:55.245W

    Synchronization: NTP V4 primary, GPSClock 300 hard PPS, FreeBSD

    Service Area: US Pacific, Los Angeles area

    Access Policy: Open to stratum 2 servers for 10 or more hosts, others upon request

    Contacts: Frank Mayhar ([email protected])

  76. US CA tick.ucla.edu (164.67.62.194) CNAMEs: navobs1.ucla.edu, time.ucla.edu

    Location: UCLA, Los Angeles, CA

    Synchronization: NTP V3 primary (GPS) HP9000/747i

    Service area: Pacific time zone, others on request

    Access policy: open access to stratum-2 servers and to UCLA clients

    Contacts: Rich Schmidt ([email protected]), Scott Burris ([email protected])

  77. US CA timekeeper.isi.edu (128.9.176.30)

    Location: USC Information Sciences Institute, Marina del Rey, CA

    Geographic Coordinates: 33:58:49N, 118:26:20W (USGS map NAD27)

    Synchronization: NTP V3 primary Datum Tymserve 2100-GPS

    Service Area: CalRen2, Los Nettos region

    Access Policy: open access

    Contact: Information Processing Center ([email protected])

  78. US CA tock.gpsclock.com (206.223.0.14)

    Location: GPSClock.com headquarters, Redondo Beach, CA

    Geographic Coordinates: 33:50:26.510N, 118:22:55.245W

    Synchronization: NTP V4 primary, GPSClock 200 hard PPS, FreeBSD

    Service Area: US Pacific, Los Angeles area

    Access Policy: Open to stratum 2 servers for 10 or more hosts, others upon request

    Contacts: Frank Mayhar ([email protected])

  79. US CA usno.pa-x.dec.com (204.123.2.72) CNAME: navobs1.pa-x.dec.com

    Location: Systems Research Center, Compaq Computer Corp. Palo Alto, CA (122 9 41.7 W 37 26 42.6 N WGS84)

    Synchronization: NTP V3 primary (GPS)

    Service area: USA Pacific and Mountain timezones, others by arrangement.

    Access Policy: open access

    Contact: Rich Schmidt, US Naval Observatory ([email protected]) Paul Flaherty, Digital Equipment Corp.([email protected])

  80. US CO navobs1.usnogps.navy.mil (204.34.198.40) CNAME: tick.usnogps.navy.mil

    Location: Falcon AFB, Colorado

    Geographic Coordinates: 104 31 30 W, 38 48 30 N WGS84

    Synchronization: NTP V3 primary (USNO Alternate Master Clock H-maser) HP9000/747i

    Service area: USA Pacific and Mountain timezones, others by arrangement.

    Access Policy: open access

    Contact: Rich Schmidt, US Naval Observatory ([email protected])

  81. US CO navobs2.usnogps.navy.mil (204.34.198.41) CNAME: tock.usnogps.navy.mil

    Location: Falcon AFB, Colorado

    Geographic Coordinates: 104 31 30 W, 38 48 30 N WGS84

    Synchronization: NTP V3 primary (USNO Alternate Master Clock H-maser) HP9000/747i

    Service area: USA Pacific and Mountain timezones, others by arrangement.

    Access Policy: open access

    Contact: Rich Schmidt, US Naval Observatory ([email protected])

  82. US CO time-a.nist.gov (129.6.15.28) New Access policy: Open only to existing users; other users please use time-b or time-c instead.
  83. US CO time-a.timefreq.bldrdoc.gov (132.163.135.130, 132.163.4.101)

    Location: NIST Boulder Laboratories, Boulder, Colorado

    Synchronization: Direct 1 pps from clock ensemble; lockclock algorithm and ACTS dial-up as backup; DEC Alpha/UNIX

    Service Area: NSFnet, WESTnet

    Access Policy: Open to stratum-2 servers, others by arrangement; please use only one of the servers as primary with the other as a backup.

    Contact: Judah Levine ([email protected]) 303 492 7785.

  84. US CO time-b.timefreq.bldrdoc.gov (132.163.135.131, 132.163.4.102)

    Location: NIST Boulder Laboratories, Boulder, Colorado

    Synchronization: Direct 1 pps from clock ensemble; lockclock algorithm and ACTS dial-up as backup; DEC Alpha/UNIX

    Service Area: NSFnet, WESTnet

    Access Policy: Open to stratum-2 servers, others by arrangement; please use only one of the servers as primary with the other as a backup.

    Contact: Judah Levine ([email protected]) 303 492 7785

  85. US CO time-c.timefreq.bldrdoc.gov (132.163.135.132, 132.163.4.103)

    Location: NIST Boulder Laboratories, Boulder, Colorado

    Synchronization: Direct 1 pps from clock ensemble; lockclock algorithm and ACTS dial-up as backup; DEC Alpha/UNIX.

    Service Area: NSFnet, WESTnet

    Access Policy: Open to servers with at least 10 clients; others by arrangement. please use only one of these servers primary with the other as backup.

    Contact: Judah Levine ([email protected]) 303 492 7785.

  86. US CO time-d.timefreq.bldrdoc.gov (132.163.135.133, 132.163.4.104)

    Location: NIST Boulder Laboratories, Boulder, Colorado

    Synchronization: interlock algorithm with direct 1 pps from clock ensemble as backup; DEC Alpha/UNIX.

    Service Area: NSFnet, WESTnet

    Access Policy: Used for testing and algorithm development. NOT for general use.

    Contact: Judah Levine ([email protected]) 303 492 7785

  87. US CO time.nist.gov (192.43.244.18)

    Location: National Center for Atmospheric Research, Boulder, Colorado

    Geographic Coordinates: 39:58:43.44N 254:43:32.5E +1840m (WGS 84)

    Synchronization: ACTS dial-up with NTP backup, DEC Alpha UNIX Service Area: NSFnet, WESTnet

    Access Policy: open to stratum-2 servers and others by arrangement

    Contact: Judah Levine ([email protected]), (303) 492-7785

  88. US CO utcnist.colorado.edu (128.138.140.44)

    Location: JILA Laboratory, University of Colorado

    Synchronization: ACTS dial-up using lockclock algorithm; DEC Alpha UNIX

    Service Area: Western US

    Access Policy: Open to All Colorado users, other stratum-2 servers; others by arrangement

    Contact: Judah Levine ([email protected]) 303 492-7785

  89. US DC ntp2.usno.navy.mil (192.5.41.209)

    Location: U.S. Naval Observatory, Washington, DC

    Geographic Coordinates: 77 03 57.7W 38 55 14.1N WGS84

    Synchronization: NTP V3 primary (USNO Master Clocks 1,2, and GPS)

    Service area: USA Eastern timezone, others by arrangement

    Access Policy: open access for stratum 2 servers

    Contact: Rich Schmidt, US Naval Observatory ([email protected])

  90. US DC tick.usno.navy.mil (192.5.41.40)

    Location: U.S. Naval Observatory, Washington, DC

    Geographic Coordinates: 38:55:14.01 77:03:58.03 (GPS WGS84)

    Synchronization: NTP V3 primary (USNO Master Clock 2, H-maser), HP9000/747i

    Service Area: NSFNET

    Access Policy: open access

    Contact: Rich Schmidt ([email protected])

  91. US DC tock.usno.navy.mil (192.5.41.41)

    Location: U.S. Naval Observatory, Washington, DC

    Geographic Coordinates: 38:55:14.01 77:03:58.03 (GPS WGS84)

    Synchronization: NTP V3 primary (USNO Master Clock 2, H-maser), HP9000/747i

    Service Area: NSFNET

    Access Policy: open access

    Contact: Rich Schmidt ([email protected])

  92. US DE mizbeaver.udel.edu (128.4.1.2)

    Location: University of Delaware, Newark, DE

    Geographic Coordinates: 39:40:48.425N, 75:45:02.392W (GPS WGS84)

    Synchronization: NTP V4 primary (GPS clock), TrueTime NTS-200-GPS

    Service Area: CAIRN, Abilene/vBNS

    Access Policy: closed access, except for stratum-2 servers providing synchronization to local networks of ten or more hosts

    Contact: Dave Mills <[email protected]>

    Note: This server does not implement the NTP control-message protocol

  93. US DE ntp1.connectiv.com (138.39.7.20)

    Location: Conectiv Inc., Newark DE

    Synchronization: NTP primary (GPS clock), Odetics GPS Receiver and Sun Sparc 5

    Service area: AT&T and QWEST

    Access policy: open access

    Contact: John K. Scoggin ([email protected])

  94. US DE ntp1.nss.udel.edu (128.175.60.175)

    Location: University of Delaware, Newark, DE

    Geographic Coordinates: 39:40:35.8N, 75:44:36.6W (GPS WGS 84)

    Synchronization: NTP V3 Primary (GPS clock), TrueTime NTS-100-GPS

    Service Area: BBN Planet SER

    Access Policy: closed access, except for stratum-2 servers providing synchronization to local networks of ten or more hosts

    Contact: Ron Reisor ([email protected])

    Note: This server does not implement the NTP control-message protocol.

  95. US DE rackety.udel.edu (128.4.1.1)

    Location: University of Delaware, Newark, DE

    Geographic Coordinates: 39:40:48.425N, 75:45:02.392W (GPS WGS84)

    Synchronization: NTP V4 primary (GPS clock), Sun IPC/SunOS 4.1.3

    Service Area: CAIRN, Abilene/vBNS

    Access Policy: closed access, except for stratum-2 servers providing synchronization to local networks of ten or more hosts

    Contact: Dave Mills <[email protected]>

    Note: service is restricted to NTP Version 4 clients only.

  96. US FL ntp-s1.cise.ufl.edu (128.227.205.3) (CNAME ntp-ufl.usno.navy.mil)

    Location: University of Florida, Gainesville, FL

    Synchronization: NTP V3 primary (TrueTime GPS-VME)

    Service area: Eastern time zone US

    Access Policy: open access for stratum 2 servers and UFL clients,others by arrangement

    Contacts: Rich Schmidt, US Naval Observatory

    CISE, Univ. Florida

  97. US GA navobs1.gatech.edu (130.207.244.240) CNAMES: tick.gatech.edu, ntp-gatech.usno.navy.mi

    Location: Georgia Institute of Technology, Atlanta, GA

    Geographic Coordinates: 84 23 40.9W 33 46 30.0N WGS84

    Synchronization: NTP V3 primary (GPS clock)

    Service area: USA Eastern timezone, others by arrangement

    Access Policy: open access for stratum 2 servers

    Contacts: Rich Schmidt, US Naval Observatory ([email protected]), Ray Spalding, Georgia Institute of Technology,([email protected])

  98. US GA time.twc.weather.com (216.133.140.77)

    Location: The Weather Channel, Atlanta GA

    Geographic Coordinates: 33:53:39.94N, 84:27:47.98W

    Synchronization: NTP V4 primary (CMDA), Sun/Solaris

    Servcice Area: Primarily Southeastern US

    Access policy: Open access for stratum 2 servers

    Contact: NTP Administrator

    Note: IP addresses are subject to change; please use DNS Important: Access policies subject to change if server is overloaded or abused. No access for dial-up or DHCP systems.

  99. US HI tick.mhpcc.hpc.mil (140.31.199.8) (CNAME: ntp-mhpcc.usno.navy.mil)

    Location: Maui High Performance Computing Center

    Geographic Coordinates: 20 44.9286 N, 156 26.4070 W

    Synchronization: NTP V3 primary (Brandywine/Motorola Oncore GPS)

    Service area: Hawaii, others on request

    Access Policy: open access for stratum 2 servers

    Contacts: Rich Schmidt ([email protected]), MHPCC NTP administrator ([email protected])

  100. US IL ntp0.mcs.anl.gov (140.221.8.88) (CNAME ntp-anl.usno.navy.mil)

    Location: Argonne National Laboratories, Chicago, IL

    Synchronization: NTP V3 primary (Brandywine Syncclock32/Oncore GPS)

    Service area: Central time zone US

    Access Policy: open access for stratum 2 servers and ANL clients,others by arrangement

    Contacts: Rich Schmidt, US Naval Observatory Bill Nickless, Argonne National Labs

  101. US IL truechimer.cso.uiuc.edu (128.174.5.58)

    Location: University of Illinois, Urbana-Champaign, IL

    Synchronization: NTP V3 primary (WWVB clock), IBM-RS6000/250

    Service Area: CICNET, Midwest, NCSA region

    Access Policy: closed access except for peers that meet the three conditions outlined in the "Time Servers" section of this file. State agreement with those conditions in notification message. All others may use the ntp-{0,1,2}.cso.uiuc.edu stratum 2 servers.

    Contact: Charley Kline ([email protected])

    Note: truechimer is a DNS CNAME. The host with the WWVB clock will always have the truechimer alias.

  102. US IN tick.cerias.purdue.edu(128.10.252.7) (alias darkcity.cerias.purdue.edu)

    Location: CERIAS, Purdue University, West Lafayette, IN Synchronization: NTP V3/V4

    primary (GPS), Symmetricom TymServe 2100L Geographic Coordinates: 40:25:33.2N, 86:54:54.7W (GPS)

    Service Area: Internet2, CIC, and midwest US

    Access Policy: open access to significant stratum 2 servers in the service areas.

    Please send a message to notify, and see our ntp WWW page. Contact: Gene Spafford ( [email protected] )

    Note: This host does not support "daytime" — only UDP-based NTP.

  103. US IN tock.cerias.purdue.edu(128.10.252.6) (alias caspak.cerias.purdue.edu)

    Location: CERIAS, Purdue University, West Lafayette, IN Synchronization: NTP V3/V4 primary (GPS), Symmetricom TymServe 2100L

    Geographic Coordinates: 40:25:33.2N, 86:54:54.7W (GPS)

    Service Area: Internet2, CIC, and midwest US

    Access Policy: open access to significant stratum 2 servers in the service areas. Please send a message to notify, and see our ntp WWW page.

    Contact: Gene Spafford ( [email protected] ) Note: This host does not support "daytime" — only UDP-based NTP.

  104. US MA bonehed.lcs.mit.edu (18.26.4.105)

    Location: Massachusetts Institute of Technology, Cambridge, MA

    Synchronization: Motorola Oncore UT+ GPS, xntp3-5.90, FreeBSD 3.2

    Service Area: Eastern US

    Access Policy: open access

    Contact: Robert Morris ([email protected])

  105. US MA ntp.quidnet.com (140.239.15.7)

    Location: Concord, MA

    Synchronization: NTP V4 primary, Motorola Oncore VP GPS, Linux

    Service Area: Eastern US

    Access Policy: open access for stratum 2 servers, please notify

    Contact: [email protected]

  106. US MA tick.mit.edu (18.145.0.30) CNAME: navobs1.mit.edu

    Location: Massachusetts Institute of Technology, Cambridge, MA

    Synchronization: NTP V3 primary (GPS) HP9000/747i

    Service Area: eastern time zone, others on request

    Access Policy: open access to stratum-2 servers and to MIT clients

    Contacts: Rich Schmidt ([email protected])

  107. US MA time.keneli.org

    Location: Cambridge, MA

    Synchronization: Motorola Oncore UT+ GPS, Linux

    Service Area: Eastern US

    Access Policy: open access

    Contact: Kenneth Baker ([email protected])

    Note: IP addresses are subject to change; please use DNS.

  108. US MA timeserver.cs.umb.edu (158.121.95.4)

    Location: University of Massachusetts at Boston

    Geographic Coordinates: 42:18:83N, 71:02:36W.

    Synchronization: NTP V3/V4 primary (GPS), TrueTime NTS-200

    Service Area: New England

    Access Policy: Open access to stratum-2 servers in service area; any SOHO’s in Massachusetts.

    Contact: Rick Martin ([email protected])

    Note: IP addresses are subject to change; please use DNS.

  109. US MD time-b.nist.gov (129.6.15.29)

    Location: NIST Central Computer Facility, Gaithersburg, Maryland

    Synchronization: ACTS dial-up using lockclock algorithm, DEC Alpha/UNIX

    Service Area: NSFnet, SURAnet

    Access Policy: Open to stratum-2 servers, others by arrangement; please use one of the servers as primary with the other as a backup.

    Contact: Judah Levine ([email protected]`.nist.gov) 303 492 7785

  110. US MD umd1.umd.edu (128.8.10.1)

    Location: University of Maryland, College Park, MD

    Synchronization: NTP V3 primary (WWVB clock), Fuzzball

    Service Area: NSFNET, SURA region

    Access Policy: closed access, except for stratum-2 servers providing synchronization to local networks of ten or more hosts

    Contact: Michael Petry ([email protected])

  111. US ME ntp.colby.edu (137.146.210.250) (CNAME ntp-colby.usno.navy.mil)

    Location: Colby College, Waterville, ME

    Geographic Coordinates: 69 39 42.0 W, 44 33 48 N WGS84

    Synchronization: NTP V3 primary (GPS)

    Service area: Northeastern US and Canada, others by arrangement

    Access Policy: open access for stratum 2 servers

    Contacts: Rich Schmidt, US Naval Observatory ([email protected]), Jeff Earickson, Colby College ([email protected])

    Note: IP addresses are subject to change; please use DNS.

  112. US MO navobs1.wustl.edu (128.252.19.1) CNAME: tick.wustl.edu

    Location: Washington University, St. Louis, MO

    Synchronization: NTP V3 primary (GPS) HP9000/747i

    Service area: USA Central timezone, others by arrangement.

    Access Policy: open access

    Contact: Rich Schmidt,US Naval Observatory ([email protected])

  113. US NC ncnoc.ncren.net (192.101.21.1)

    Location: MCNC, Research Triangle Park, NC

    Synchronization: NTP V3 primary (WWVB clock), Netclock/2, Sun 4/65

    Service area: NC-REN region

    Access Policy: NC-REN region, other use by prior arrangement

    Contact: Tim Seaver ([email protected], [email protected])

  114. US NC terrapin.csc.ncsu.edu 152.1.58.124

    Location: North Carolina State University, Raleigh, NC

    Synchronization: NTP primary (GPS clock), Trimble Palisade

    Service Area: South Eastern US

    Access Policy: open access

    Contact: Sven Dietrich, NCSU, [email protected]

  115. US NJ ntp0.jensenresearch.com (65.211.109.12)

    Location: Jensen Research Corporation, Oakland NJ

    Geographic Coordinates: 41 00.975 N, 74 15.262 W

    Synchronization: NTP V4 primary; Præcis Ct CDMA clock; Intel PIII/866 Win2K

    Service Area: Eastern US

    Access Policy: Closed access, except for stratum-2 servers providing synchronization to local networks of ten or more hosts; others by arrangement only. Please send a message to notify.

    Contact: JRC Network Ops ([email protected]) 201 337-4000

    Note: IP addresses are subject to change; please use DNS.

  116. US NY nist1-ny.glassey.com (208.184.49.9)

    Location: Abovenet, New York City, New York

    Synchronization: ACTS dial-up using lockclock algorithm; DEC Alpha UNIX

    Service Area: North Eastern US

    Access Policy: Open to stratum-2 servers and others by arrangement

    Contact: Judah Levine ([email protected]) 303 492-7785

  117. US OH lerc-dns.lerc.nasa.gov (128.156.1.43)

    Location: NASA Lewis Research Center, Cleveland, OH

    Synchronization: NTP Primary (WWVB clock), Sun/Unix Service Area: NSFNET, OARNET

    Access Policy: open access

    Contact: Joe Rossoll ([email protected])

  118. US OK now.okstate.edu (139.78.100.163) CNAME: ntp-okstate.usno.navy.mil

    Location: Oklahoma State University, Stillwater, OK

    Geographic Coordinates: 97 04 17.0 W, 36 07 19.7 N  WGS84

    Synchronization: NTP V4 primary (Motorola UT+)

    Service area: Central Time Zone, others by arrangement

    Access Policy: open access

    Contacts: Rich Schmidt, US Naval Observatory ([email protected]), Matthew Collier, Oklahoma State University ([email protected])

  119. US PA gps1.otc.psu.edu (128.118.25.12)

    Location: Penn State University, University Park, PA

    Geographic Coordinates: 40:47:58.1N, 77:51:44.8W (USGS 40077-G7-TF-024)

    Synchronization: NTP V3 primary (GPS), TrueTime XL/DC NTP module

    Service Area: Internet2, vBNS, CERFnet(AT& T IP Services), PSC/NCNE, CASC.

    Access Policy: closed access, except for stratum-2 servers providing synchronization to local networks of ten or more hosts; others by arrangement only

    Contact: John Balogh <[email protected]>

    Note: the IP address for gps1.otc.psu.edu may change; please use DNS. This hardware does not support rdate or daytime protocols; NTPv3 only.

  120. US PA otc1.psu.edu (128.118.46.3)

    Location: Penn State University, University Park, PA

    Synchronization: NTP V3 primary (WWV clock), Sun/Unix

    Service Area: NSFNET, PREPNET, JvNCnet

    Access Policy: open access

    Contact: John Balogh ([email protected]) (no longer: [email protected]cl.psu.edu)

  121. US PA wwv.otc.psu.edu (128.118.46.3)

    Location: Penn State University, University Park, PA

    Geographic Coordinates: 40:47:58.1N, 77:51:44.8W (USGS 40077-G7-TF-024)

    Synchronization: NTP V3 primary (Traconex/PSTI-1020 WWV clock), Sun/Unix

    Service Area: Internet2, vBNS, CERFnet(AT& T IP Services), PSC/NCNE, CASC.

    Access Policy: open access

    Contact: John Balogh <[email protected]>

    Note: wwv.otc.psu.edu is the CNAME for this service. The IP address WILL change sometime after mid-year 1999; please use DNS.

  122. US TX tick.uh.edu (129.7.1.66) CNAME: time.uh.edu

    Location: University of Houston, Houston, TX

    Geographic Coordinates: 29:43:37N,95:20:22W

    Synchronization: NTP V3 primary (GPS) HP9000/747i

    Service Area: US Central time zone, others on request

    Access Policy: open access to stratum-2 servers and to UH clients

    Contacts: Rich Schmidt ([email protected]), Alan Pfeiffer-Traum ([email protected])

  123. US UT time.xmission.com (198.60.22.240)

    Location: XMission Internet, Salt Lake City, Utah

    Synchronization: Motorola Oncore UT+ GPS, ntp-4.1.1a, Linux 2.4.18-nano

    Service Area: Western US

    Access Policy: open access

    Contact: [email protected]

  124. US VA: nist1.aol-va.truetime.com (64.236.96.53)

    Location: AOL Time Warner facility, Dulles, Virginia

    Synchronization: Lockclock Algorithm and ACTS dial-up, GPS-stabilized oscillator for short-term stabilization

    Service Area: Eastern US

    Access Policy: Open access for up to 20 queries per hour (one-day average) from any one address, others by arrangement

    Contact: Judah Levine, [email protected], 303 492 7785

  125. US VA nist1-dc.glassey.com (216.200.93.8)

    Location: Abovenet, Vienna, VA

    Synchronization: ACTS dial-up using lockclock algorithm; DEC Alpha UNIX

    Service Area: Primarily networks in Eastern US

    Access Policy: Open to stratum-2 servers and others by arrangement.

    Contact: Judah Levine ([email protected]) 303 492-7785

  126. US WA bigben.cac.washington.edu 140.142.16.34 (CNAME ntp-wu.usno.navy.mil)

    Location: University of Washington, Seattle, WA

    Synchronization: NTP primary (GPS clock), HP9000/747i HPUX

    Service Area: Pacific Northwest

    Access Policy: open access to Pacific Time Zone stratum 2’s and to Univ. of Washington clients; others by arrangement

    Contact: Rich Schmidt, USNO, [email protected], Bill Mar, Univ. of Washington ([email protected])

  127. US WA time-nw.nist.gov (131.107.1.10)

    Location: Microsoft Corporation, Redmond, Washington

    Synchronization: ACTS Dial-up and lockclock algorithm, DEC Alpha/UNIX

    Service Area: NorthWestNet, NSFnet

    Access policy: open to stratum-2 servers and others by arrangement.

    Contact: Judah Levine ([email protected]) (303) 492-7785

  128. US WI ben.cs.wisc.edu (128.105.201.11)

    Location: Computer Science Department, University of Wisconsin-Madison

    Geographic Coordinates: 89:24:30W, 43:08:00N

    Synchronization: NTP V4 primary (Odetics GPS), Sun/Sparc

    Service Area: US/any

    Access Policy: One primary and one secondary per domain, by request

    Contact: David Thompson ( [email protected])

    Note: IP addresses are subject to change; please use DNS

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