PogoWalt Kelly
Important: See Public NTP Time Servers for the rules of engagement and general conditions of use. The servers in this list are sorted first by country code, then state code (US only), then host name. Last update: 11 anuary 2002 UTC
AU ntp.ise.canberra.edu.au (137.92.140.80)
Location: The University of Canberra, Canberra Australia.
Geographic Coordinates: 35:14.2819S 149:05.1620E (WGS-84)
Synchronization: NTP V4 primary (GPS clock), i386/NetBSD 1.5.2
Service area: Australia, New Zealand
Access policy: open access, please limit to two peer hosts per site
Contact: Ross Johnson (ntp@ise.canberra.edu.au)
AU ntp.cs.mu.OZ.AU (128.250.36.2)
Location: The University of Melbourne, Melbourne Australia.
Geographic Coordinates: 37:48:06S 144:57:44E
Synchronization: NTP V3 primary (GPS clock), Sun Sparc2/SunOS
4.1.4
Service area: Australia, New Zealand, PACCOM (by prior
arrangement)
Access policy: open access, please limit to two peer hosts per
site
Contact: David Hornsby (ntp@cs.mu.OZ.AU)
AU ntp.mel.nml.CSIRO.AU (138.194.21.154)
Location: CSIRO Division of Materials Science and Technology,
Melbourne, Australia.
Geographic Coordinates: 37:54:25S 145:08:05E
Synchronization: NTP V4, primary clock is a HP 5071A Caesium Beam
Frequency Standard (synchronized to UTC Australia via a common view
GPS link) via a custom interface, backup is a Truetime GPS
receiver, Linux
Service Area: AARNet
Access Policy: open access
Contact: time@tip.csiro.au
Note: This NTP server is operated by the CSIRO National
Measurement Laboratory, Sydney, Australia.
AU ntp.nml.csiro.au (130.155.98.1)
Location: CSIRO National Measurement Laboratory, Sydney,
Australia.
Geographic Coordinates: 33:46:58S 151:09:06E
Synchronization: NTP V4, primary clock is a HP 5071A Caesium Beam
Frequency Standard (designated as UTC Australia) via a custom
interface and a Leitch CSD-5300 Master Clock System Driver, backup
clocks are a Truetime GPS receiver and a Hewlett Packard GPS
receiver, Linux
Service Area: AARNet
Access Policy: open access
Contact: time@tip.csiro.au
AU ntp.per.nml.csiro.au (130.95.156.206)
Location: Physics Department,University of WA, Perth,
Australia.
Geographic Coordinates: 31:58:43S 115:49:00E
Synchronization: NTP V4, primary clock is a rubidium oscillator
(synchronized to UTC Australia via a common view GPS link) via a
custom interface, backup is a Motorola UT Oncore GPS receiver,
Linux
Service Area: AARNet
Access Policy: open access
Contact: time@tip.csiro.au
Note: This NTP server is operated by the CSIRO National
Measurement Laboratory, Sydney, Australia.
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: ntp-admin@rnp.br
CA clock.cmc.ec.gc.ca
Location: Canadian
Meteorological Centre, Dorval, Québec, Canada
Synchronization: NTP V3 primary (GOES OM/DC-468 clock),
HP-UX/Unix
Service Area: Econet (Environment Canada national network)
Access Policy: open within Econet. Outside by prior arrangement
only.
Contact: (
ntp-admin@cmc.ec.gc.ca)
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
(timekeeper@uregina.ca)
Note: for reliable access please notify with IP of your server
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 (alfred.hovdestad@usask.ca)
Note: priority given to local regional sites
Note: tick.usask.ca and tock.usask.ca share a single GOES
receiver
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 (alfred.hovdestad@usask.ca)
Note: priority given to local regional sites
Note: tick.usask.ca and tock.usask.ca share a single GOES
receiver
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 (time@iis.ee.ethz.ch)
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 (gperez@dgf.uchile.cl)
Note: ntp is an alias and the IP address may change; please use
DNS.
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 (ntp-admin@cesnet.cz)
Note: ntp is an alias and the IP address may change; please use
DNS.
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 (time@informatik.uni-erlangen.de) Note:
IP addresses are subject to change; please use DNS
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 (time@informatik.uni-erlangen.de)
Note: IP addresses are subject to change; please use DNS
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 (time@informatik.uni-erlangen.de)
Note: IP addresses are subject to change; please use DNS
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 (time@informatik.uni-erlangen.de)
Note: IP addresses are subject to change; please use DNS
DE ntpa2.kph.uni-mainz.de (134.93.132.118)
Location: Johannes Gutenberg-University, Institut fuer Kernphysik,
Mainz, Germany
Synchronization: NTP V3 with DCF77 receiver, K6/Linux
Service Area: University of Mainz and all European Community
Countries ONLY! Exceptions are only given to Switzerland, Poland
and Czech Republic.
Access Policy: Open access for stratum 2 servers if e-mail is sent
in order to notify. Users from outside the service area will be
ignored if the contact is kept alive for a longer period. Stratum
>2 servers will be ignored, too. Computers, connected via dialin
or computers that have unresolvable IP-numbers will be ignored from
every location! Consult http://wwwa2.kph.uni-mainz.de/ntpa2/ for
details!
Contact: wwwa2@kph.uni-mainz.de
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 (gg@cs.tu-berlin.de)
DE ntps1-0.uni-erlangen.de (131.188.1.40)
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
SS2/Unix SunOS 4.1.3
Service Area: Germany/Europe
Access Policy: open access, pick one of ntps1-{0,1,2}.uni-
erlangen.de
Contact: Frank Kardel, Rainer Pruy
(time@informatik.uni-erlangen.de)
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 (gg@cs.tu-berlin.de)
DE ntps1-1.rz.Uni-Osnabrueck.DE (131.173.17.7)
Location: University of Osnabrueck, D-49069 Osnabrueck, FRG
Synchronization: NTP V3 primary (DCF77 clock), Sun/Unix
Service Area: Germany/Europe
Access Policy: open access
Contact: Gernot Skalla (timeadm@Uni-Osnabrueck.DE)
DE ntps1-1.uni-erlangen.de (131.188.1.45)
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 4/690/SunOS 4.1.3
Service Area: Germany/Europe
Access Policy: open access, pick one of ntps1-{0,1,2}.uni-
erlangen.de
Contact: Frank Kardel, Rainer Pruy
(time@informatik.uni-erlangen.de)
DE ntps1-2.uni-erlangen.de (131.188.1.31)
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 4/490/SunOS 4.1.3
Service Area: Germany/Europe
Access Policy: open access, pick one of ntps1-{0,1,2}.uni-
erlangen.de
Contact: Frank Kardel, Rainer Pruy
(time@informatik.uni-erlangen.de)
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 (ntp-admin@ptb.de)0
Note: ptbtime1.ptb.de is an alias and the IP address may change;
please use DNS.
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 (ntp-admin@ptb.de)
Note: ptbtime2.ptb.de is an alias and the IP address may change;
please use DNS.
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 (wehinger@rus.uni-stuttgart.de)
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 (phk@FreeBSD.org)
Note: timestamps better than +/-50 nsec
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 (phk@FreeBSD.org)
Note: timestamps better than +/-5 usec.
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: ntp-adm@inria.fr
Note: We use a Datel RCH208 clock with SER024 V24 interface.
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: timemaster@cru.fr
Note: use DNS for IP address
FR ntp-p1.obspm.fr
Location: LPTF - Observatoire de Paris, France
Synchronization: NTP V3, Datum TymServe 2100 with 1PPS
Service Area: France/Europe
Access Policy: open access to stratum-2 servers, send a message to
notify
Contact: lptfop@obspm.fr
Note: use DNS for IP address. Ref: 1PPS from Atomic Clock
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 access, please send a message to notify
Contact:
ntp-adm@sophia.inria.fr, More help?
Note: We use a MC2 Starsync GPS EISA card
HK clock.cuhk.edu.hk (137.189.6.18)
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 & South East Asia
Access Policy: open access
Contact: Connie Law (connieL@cuhk.edu.hk), KM Fung
(kinming@cuhk.edu.hk) Note: IP addresses are subject to change;
please use DNS
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 (pollastri@cstv.to.cnr.it)
Note: information at http://www.cstv.to.cnr.it/toi
IT time.ien.it (193.204.114.1)
Location: IEN Galileo Ferraris, Torino, Italy
Synchronization: NTP primary (Cesium Beam Frequency Standard),
Sun/Unix
Service Area: Italy/Europe
Access Policy: open access
Contact: denasi@ien.it
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 (tsuruoka@fukuoka-u.ac.jp), YOSHIMURA
Kenji (yosimura@tl.fukuoka-u.ac.jp)
Note: We use a TRAK 8810 GPS STATION CLOCK and a Furuno Electric
Co.'s GN-72 GPS receiver respectively.
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 (tsuruoka@fukuoka-u.ac.jp), YOSHIMURA
Kenji (yosimura@tl.fukuoka-u.ac.jp)
Note: We use a TRAK 8810 GPS STATION CLOCK and a Furuno Electric
Co.'s GN-72 GPS receiver respectively.
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
primary
frequency standard of CENAM, UTC(CENAM)
Service Area: All Mexico and USA
Access policy: Open access
Contact: J. Mauricio Lopez R., jlopez@cenam.mx , 52 4 211 0543
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: beheer@nl.net
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: beheer@nl.net
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: beheer@nl.net
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: (timekeeper@uit.no)
NZ clock1.canterbury.ac.nz (132.181.12.13)
Location: Computer
Science Department, University of Canterbury
Synchronization: NTP V4 primary (Trimble Palisade GPS),
Sun/Sparc
Service Area: New Zealand
Access Policy: restricted to stratum-2 servers providing
synchronization to local networks of ten or more hosts, by prior
arrangement
Contact: Pete Glassenbury (pete@cosc.canterbury.ac.nz)
Note: IP addresses are subject to change; please use DNS
PL ntp.certum.pl (212.244.2.172)
Location: Unizeto Sp. z o.o., ul. Krolowej Korony Polskiej 21-23,
70-486 Szczecin
Geographic Coordinates: 53:26:15N 014:31:58E
Synchronization: NTP V4 primary (Meinberg GPS 167/PPS/TGP),
Linux
Service Area: Poland/Europe
Access Policy: open access
Contact: Wojtek Slusarczyk (wojtek@certum.pl)
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 (kondor@cbk.poznan.pl), Jerzy Nawrocki
(nawrocki@cbk.poznan.pl)
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
info@sp.se
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
info@sp.se
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 (roll@Stupi.SE)
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: roll@stupi.se (Peter Lothberg)
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: timekeeper@singnet.com.sg
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: Mark
Martinec (timekeeper@ijs.si); More info?
Note: NTP V4 clients preferred for their lower load and better
accuracy; IP address subject to change
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 (chrisb@csr.net)
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: jips-nosc@nosc.ja.net
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.
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
(res@tuttle.usno.navy.mil)
US CA clepsydra.dec.com (16.1.0.4, 204.123.2.5)
Location: DEC Western Research Laboratory, Palo Alto, CA
Synchronization: NTP V3 primary (GPS clock), PC/BSDI 2.1
Service Area: NSFNET, BARR region
Access Policy: open access, send email to notify before using
Contact: ntp-admin@pa.dec.com
Note: The host name is an alias used only for time service.
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 (paul@vix.com)
US CA clock.sgi.com (192.48.153.74)
Location: Silicon Graphics Computer Systems, Inc., Mountain View,
CA
Synchronization: NTP V3 primary (TrueTime 600 GPS/Precision
Standard
Time WWV), SGI Challenge L/Irix
Service Area: North America
Access Policy: open to stratum-2 time servers, others by
arrangement.
Contact: Bowen Goletz, (
ntp-admin@sgi.com)
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 (joe@via.net)
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, sven_dietrich@trimble.com or
zane_brady@trimble.com
US CA montpelier.ilan.caltech.edu (131.215.254.2) 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
(res@tuttle.usno.navy.mil),
Heather Sherman, California Institute of Technology,
(network@caltech.edu)
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, jlevine@boulder.nist.gov, 303 492 7785
US CA nist1.datum.com (63.149.208.50)
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 (jlevine@boulder.nist.gov) 303 492-7785
US CA nist1-sj.glassey.com (207.126.103.204)
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 (jlevine@boulder.nist.gov) 303 492-7785
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: timer@cup.hp.com
Note: no need to notify for access, go right ahead!
US CA ntp.nasa.gov (143.232.55.5)
Location: NASA Ames Research Center, Moffett Field, CA
Synchronization: NTP primary (WWVB clock), Sun/Unix
Service Area: NSFNET, BARR region, NASA NSN, DOE ESNET, DDN
Access Policy: prior permission required
Contact: clockmaster@ntp.nasa.gov
US CA tick.gpsclock.com (216.152.68.16)
Location: GPSClock.com headquarters, San Jose, CA
Geographic Coordinates: 37:16:37N, 121:53:31W
Synchronization: NTP V4 primary, GPSClock model 200 hard PPS,
Linux
Service Area: US Pacific, Abovenet/PAIX region
Access Policy: Open to stratum 2 servers for 10 or more hosts,
others upon request
Contacts: David Schwartz (clock@gpsclock.com)
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 (res@tuttle.usno.navy.mil), Scott Burris
(scott@cns.ucla.edu)
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 (action@isi.edu)
US CA tock.gpsclock.com (216.152.68.20)
Location: GPSClock.com headquarters, San Jose, CA
Geographic Coordinates: 37:16:37N, 121:53:31W
Synchronization: NTP V3 primary, GPSClock model 200 hard PPS,
FreeBSD
Service Area: US Pacific, Abovenet/PAIX region
Access Policy: Open to stratum 2 servers for 10 or more hosts,
others upon request
Contacts: David Schwartz (clock@gpsclock.com)
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
(res@tuttle.usno.navy.mil) Paul Flaherty, Digital Equipment
Corp.(flaherty@pa.dec.com)
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
(res@tuttle.usno.navy.mil)
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
(res@tuttle.usno.navy.mil)
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.
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 (jlevine@time.nist.gov) 303 492 7785.
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 (jlevine@time.nist.gov) 303 492 7785
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 (jlevine@time.nist.gov) 303 492 7785.
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 (jlevine@time.nist.gov) 303 492 7785
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 (jlevine@time.nist.gov), (303) 492-7785
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 (jlevine@boulder.nist.gov) 303 492-7785
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
(res@tuttle.usno.navy.mil)
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 (res@tuttle.usno.navy.mil)
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 (res@tuttle.usno.navy.mil)
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
<mills@udel.edu>
Note: This server does not implement the NTP control-message
protocol
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 (john.scoggin@conectiv.com)
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 (ron@udel.edu)
Note: This server does not implement the NTP control-message
protocol.
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
Important: From 1 May 2001 service is restricted to NTP Version 4
clients only.
Contact: Dave Mills
<mills@udel.edu>
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.
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
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
(res@tuttle.usno.navy.mil),
Ray Spalding, Georgia Institute of Technology,
(cc100aa@xray.oit.gatech.edu)
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
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 (kline@uiuc.edu)
Note: truechimer is a DNS CNAME. The host with the WWVB clock will
always have the truechimer alias.
US IN darkcity.cerias.purdue.edu(128.10.252.7)
Location: CERIAS, Purdue
University, West Lafayette, IN
Synchronization: NTP primary (GPS), Datum TymServe 2100L
Service Area: Indiana
Access Policy: open access, please send a message to notify
Contact: Gene Spafford (
spaf@cerias.purdue.edu)
US HI tick.mhpcc.edu (164.122.7.123) (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 (res@tuttle.usno.navy.mil), MHPCC NTP
administrator (ntp@mhpcc.edu)
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 (rtm@lcs.mit.edu)
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 (res@tuttle.usno.navy.mil)
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 (jlevine@time.nist.gov) 303 492 7785
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 (petry@ni.umd.edu)
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 & Canada, others by
arrangement
Access Policy: open access for stratum 2 servers
Contacts: Rich Schmidt, US Naval Observatory
(res@tuttle.usno.navy.mil), Jeff Earickson, Colby College
(jaearick@colby.edu)
Note: IP addresses are subject to change; please use DNS.
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
(res@tuttle.usno.navy.mil)
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 (tas@ncren.net, clockmaster@ncren.net)
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, sven@terrapin.csc.ncsu.edu
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 (jlevine@boulder.nist.gov) 303 492-7785
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 (yyjer@scivax.lerc.nasa.gov)
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 V3 primary (TrueTime GPS-VME)
Service area: Central Time Zone, others by arrangement
Access Policy: open access
Contacts: Rich Schmidt, US Naval Observatory
(res@tuttle.usno.navy.mil), Matthew Collier, Oklahoma State
University (mwc@okstate.edu)
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 <JDB@psu.edu>
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.
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 (JohnBalogh@psu.edu) (no longer:
jdb@ecl.psu.edu)
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 <JDB@psu.edu>
Note: wwv.otc.psu.edu is the CNAME for this service. The IP
address WILL change sometime after mid-year 1999; please use
DNS.
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 (res@tuttle.usno.navy.mil), Alan Pfeiffer-
Traum (apt@uh.edu)
US VA: nist1.aol-va.truetime.com (205.188.185.33)
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, jlevine@boulder.nist.gov, 303 492 7785
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 (jlevine@boulder.nist.gov) 303 492-7785
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, res@tuttle.usno.navy.mil, Bill Mar,
Univ. of Washington (bmar@cac.washington.edu)
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 (jlevine@time-a.timefreq.bldrdoc.gov) (303)
492-7785
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 (
ntp-admin@cs.wisc.edu)
Note: IP addresses are subject to change; please use DNS
bitsy.mit.edu
chronos.univ-rennes1.fr
clock.llnl.gov
clock.osf.org
fuzzy.nta.no
ntp.cc.utexas.edu
ntp.marine.csiro.au
ntp.quidnet.com
ntp.syd.dms.csiro.au
ntp.tip.csiro.au
ntp0.sdd.hp.com
ntp0.ja.net
ntp1.sony.com
utcnist1.reston.mci.net
wave.mbari.org
wwvb.erg.sri.com
wwvb.isi.edu
wwwa2.kph.uni-mainz.de
y2k-test.timefreq.bldrdoc.gov
David L. Mills
<mills@udel.edu>