Microsoft KB Archive/262680

= A list of the Simple Network Time Protocol (SNTP) time servers that are available on the Internet =

Article ID: 262680

Article Last Modified on 12/3/2007

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APPLIES TO


 * Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
 * Microsoft Windows Server 2003, Standard Edition (32-bit x86)
 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Professional Edition
 * Microsoft Windows Small Business Server 2003 Premium Edition
 * Microsoft Windows Small Business Server 2003 Standard Edition

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This article was previously published under Q262680



SUMMARY
This article describes the Simple Network Time Protocol (SNTP) time servers that are available on the Internet.



MORE INFORMATION
There are two levels, or tiers, of Network Time Protocol (NTP) time servers that are available on the Internet. The NTP is defined in Request for Comments (RFC) 1305.

The first-level time servers are primarily intended to act as source time servers for second-level time servers. The first-level time servers may also be capable of providing mission-critical time services. Some first-level time servers may have a restricted access policy.

Second-level time servers are intended for general SNTP time service needs. Second-level time servers usually enable public access. It is recommended that you use second-level time servers for normal SNTP time server configuration because they are usually located on a closer network that can produce faster updates.

It is recommended that you research any time server selection to ensure that it can meet your specific time server requirements.

The National Institute of Standards and Technology (NIST) maintains a network of time servers that provide time and frequency services for the United States. More information about the NIST may be found at the following Web sites:

http://www.boulder.nist.gov/timefreq/service/its.htm

http://www.boulder.nist.gov/timefreq/

The US Naval Observatory also maintains a network of time servers available for public access. To see a list of servers and their descriptions, visit the following US Naval Observatory Web site:

http://tycho.usno.navy.mil/ntp.html

The NTP uses port 123 so this port must be opened on a firewall or router to ensure proper communication with the NTP server.

For more information about the use of time services in Windows Server and Windows NT, click the following article numbers to view the articles in the Microsoft Knowledge Base:

243574 &quot;Could not locate a time server&quot; after setting SNTP time server using NET TIME command

216734 How to configure an authoritative time server in Windows 2000

224799 Basic operation of the Windows Time Service

Time server list
The following list of NTP time servers is provided as a reference only. This list is not intended to be comprehensive. This list describes currently active NTP time servers that may or may not be able to accommodate your time service needs.

Any NTP time server selection should be evaluated to determine if the server in question meets your specific time server requirements.

NIST time servers

 * time-a.nist.gov

129.6.15.28

NIST, Gaithersburg, Maryland
 * time-b.nist.gov

129.6.15.29

NIST, Gaithersburg, Maryland
 * time-a.timefreq.bldrdoc.gov

132.163.4.101 (as of December 1, 1999)

NIST, Boulder, Colorado
 * time-b.timefreq.bldrdoc.gov

132.163.4.102 (as of December 1, 1999)

NIST, Boulder, Colorado
 * time-c.timefreq.bldrdoc.gov

132.163.4.103 (as of December 1, 1999)

NIST, Boulder, Colorado
 * utcnist.colorado.edu

128.138.140.44

University of Colorado, Boulder
 * time.nist.gov

192.43.244.18

NCAR, Boulder, Colorado
 * time-nw.nist.gov

131.107.1.10

Microsoft, Redmond, Washington
 * nist1.dc.certifiedtime.com

216.200.93.8

Abovnet, North Virginia
 * nist1.datum.com

209.0.72.7

Datum, San Jose, California
 * nist1.nyc.certifiedtime.com

208.184.49.129

Abovnet, New York City
 * nist1.sjc.certifiedtime.com

207.126.103.202

Abovnet, San Jose, California

Level-One Time Servers
Arranged by geographic location:

North America

 * Palo Alto, CA: Systems Research Center, Compaq Computer Corp.

204.123.2.72: usno.pa-x.dec.com; CNAME: navobs1.pa-x.dec.com

Service area: U.S. pacific and mountain time zones
 * Marina del Rey, CA: USC Information Sciences Institute

128.9.176.30: timekeeper.isi.edu

Service Area: CalRen2 and Los Nettos region
 * Washington, DC: U.S. Naval Observatory

192.5.41.41: tock.usno.navy.mil

192.5.41.40: tick.usno.navy.mil

Service Area: NSFNET
 * Ottawa, Ontario, Canada: National Research Council of Canada

time.chu.nrc.ca

Service Area: Canada
 * Raleigh, NC: North Carolina State University

152.1.58.124: terrapin.csc.ncsu.edu

Service Area: Southeastern U.S.
 * Cambridge, MA: MIT Information Systems

18.72.0.3: bitsy.mit.edu

Service Area: NSFNET and NEARnet area
 * Cambridge, MA: MIT

18.26.4.105: bonehed.lcs.mit.edu

Service Area: Eastern U.S.
 * Palo Alto, CA: Internet Software Consortium

192.5.5.250: clock.isc.org

Service Area: BARRnet, Alternet-west, and CIX-west
 * Cambridge, MA: Open Software Foundation

130.105.4.59: clock.osf.org

Service Area: NSFNET and NEARnet region
 * Palo Alto, CA: ViaNet Communications

209.81.9.7: clock.via.net
 * Cleveland, OH: Lewis Research Center (NASA)

128.156.1.43: lerc-dns.lerc.nasa.gov

Service Area: NSFNET and OARNET
 * Colorado Springs, CO: Schriever AFB

204.34.198.40: navobs1.usnogps.navy.mil; CNAME: tick.usnogps.navy.mil

204.34.198.41: navobs2.usnogps.navy.mil; CNAME: tock.usnogps.navy.mil

Service area: U.S. pacific and mountain time zones
 * St. Louis, MO: Washington University

128.252.19.1: navobs1.wustl.edu; CNAME: tick.wustl.edu

Service area: U.S. central time zone
 * Research Triangle Park, NC: MCNC

192.101.21.1: ncnoc.ncren.net

Service area: NC-REN region
 * Cupertino, CA: HP

192.6.38.127: ntp-cup.external.hp.com

Service Area: West coast U.S.
 * Newark, DE: Conectiv Communications

138.39.7.20: ntp1.delmarva.com

Service area: Cable & Wireless Network (formerly MCInet)
 * University Park, PA: Penn State University

128.118.46.3: otc1.psu.edu

Service Area: NSFNET, PREPNET, and JvNCnet

Europe

 * Borowiec, Poland: Astrogeodynamical Observatory, Space Research Centre

150.254.183.15: vega.cbk.poznan.pl

Service Area: Poland and Europe
 * Stockholm, Sweden: Stupi AB

192.36.143.151: Time2.Stupi.SE

Service Area: Europe
 * Torino, Italy: IEN Galileo Ferraris

193.204.114.1: time.ien.it

Service Area: Italy and Europe
 * Zurich, Switzerland: Integrated Systems Lab, Swiss Fed. Inst. of Technology

129.132.2.21: swisstime.ethz.ch

Service Area: Switzerland and Europe
 * Torino, Italy: CSTV of National Research Council

150.145.33.1: tempo.cstv.to.cnr.it

Service Area: Italy and Europe
 * Erlangen, Germany: University Erlangen-Nuernberg

ntp0.fau.de; ntp1.fau.de; ntp2.fau.de;

ntps1-0.uni-erlangen.de; ntps1-1.uni-erlangen.de; ntps1-2.uni-erlangen.de

Service Area: Germany and Europe
 * Berlin, Germany: Technische Universitaet Berlin

130.149.17.21: ntps1-0.cs.tu-berlin.de

130.149.17.8: ntps1-1.cs.tu-berlin.de

Service Area: Germany and Europe
 * Germany

131.173.17.7: ntps1-1.rz.Uni-Osnabrueck.DE

Service Area: Germany and Europe
 * Sweden

192.36.143.150: Time1.Stupi.SE

Service Area: SUnet and NORDUnet Sweden

East Asia and Pacific Rim

 * Hong Kong: The Chinese University of Hong Kong.

137.189.6.18: clock.cuhk.edu.hk

Service Area: Hong Kong, China, and South East Asia
 * Fukuoka, Japan: Fukuoka University

133.100.9.2: clock.nc.fukuoka-u.ac.jp

133.100.11.8: clock.tl.fukuoka-u.ac.jp

Service Area: Japan and Pacific area

Australia

 * Melbourne Australia: The University of Melbourne

128.250.36.2: ntp.cs.mu.OZ.AU

Service area: Australia and New Zealand

Level-Two Time Servers
Arranged by geographic location:

North America
NTP time servers:
 * Quebec, Canada: Canadian Meteorological Center

ntp1.cmc.ec.gc.ca; ntp2.cmc.ec.gc.ca

Service Area: Eastern Canada
 * Ontario, Canada: National Research Council of Canada

time.chu.nrc.ca; time.nrc.ca

Service Area: Canada
 * Saskatchewan, Canada: University of Regina

142.3.100.15: timelord.uregina.ca

Service Area: Canada
 * Ontario, Canada: University of Toronto

tick.utoronto.ca; tock.utoronto.ca

Service Area: Eastern Canada
 * Mexico: Audiotel office

ntp2a.audiotel.com.mx; ntp2c.audiotel.com.mx; ntp2b.audiotel.com.mx

Service Area: Avantel, MCINet, and Mexico
 * Santa Cruz, CA: Scruz-net, inc.

165.227.1.1: ns.scruz.net

Service area: Western U.S.
 * San Diego, CA: UCSD Academic Computing Services/Network Operations

132.239.254.49: ntp.ucsd.edu

Service Area: CERFNET; NSFNET, SDSC region, and nearby
 * Quincy, California

ntp1.mainecoon.com; ntp2.mainecoon.com

Service Area: North America
 * Newark, DE: University of Delaware

128.175.1.3: louie.udel.edu

Service Area: CAIRN, Abilene, and vBNS
 * Atlanta, GA: CNSG

ntp.shorty.com

Service Area: Southeast U.S.
 * Kennesaw, GA: PeachNet

rolex.peachnet.edu; timex.peachnet.edu

Service Area: PeachNet (Georgia) and Southeast U.S.
 * Urbana-Champaign, IL: University of Illinois

ntp-0.cso.uiuc.edu; ntp-1.cso.uiuc.edu; ntp-2.cso.uiuc.edu

Service Area: CICNET, Midwest, and NCSA region
 * Chicago, IL: Argonne National Laboratory

ntp-1.mcs.anl.gov; ntp-2.mcs.anl.gov

Service Area: NSF/ANSNet, CICNet, NetIllinois, and ESNet
 * West Lafayette, IN: Purdue University

gilbreth.ecn.purdue.edu; harbor.ecn.purdue.edu; molecule.ecn.purdue.edu

Service area: NSFNET and CICNET area
 * Manhattan, KS: KansasNet OnLine Services

199.240.130.1: ntp1.kansas.net

199.240.130.12: ntp2.kansas.net

Service area: Central U.S. and Great Plains
 * Boston, MA: UMass-Boston CS dept.

158.121.104.4: timeserver.cs.umb.edu

Service Area: New England
 * Minneapolis/St Paul, MN: University of Minnesota

ns.nts.umn.edu; nss.nts.umn.edu

Service Area: CICNET region
 * Columbia, MO: University of Missouri-Columbia

128.206.206.12: everest.cclabs.missouri.edu

Service Area: MOREnet
 * Omaha, NE: Radiks Internet Access

205.138.126.83: allison.radiks.net

Service Area: Midwest U.S.
 * Las Vegas, NV: University of Nevada System Computing Services

131.216.1.101: cuckoo.nevada.edu

Service Area: NevadaNet, NSFNET, and SDSC region
 * Las Vegas, NV: UNLV College of Engineering

tick.cs.unlv.edu; tock.cs.unlv.edu

Service Area: Sprintnet
 * New York City, NY: Columbia University

ntp.ctr.columbia.edu

Service Area: Sprintlink and NYSERnet
 * Ithaca, NY: Cornell University

192.35.82.50: ntp0.cornell.edu

Service Area: NSFNET and NYSER region
 * New York, NY: Morningside Campus, Columbia University

sundial.columbia.edu

Service Area: NYSERnet
 * New York City, NY: Columbia University Computer Science Department

timex.cs.columbia.edu

Service Area: PSINET; NSFNET, and NYSER region
 * Norman, Oklahoma: University of Oklahoma

129.15.22.8: constellation.ecn.uoknor.edu

Service Area: Midnet
 * Coos Bay, OR: Koala Computers

207.48.109.6: tick.koalas.com

Service Area: Northwestern U.S.
 * University Park, PA: Penn State University

128.118.25.3: clock.psu.edu

Service Area: Internet2, vBNS, CERFnet(AT&T IP Services), PSC/NCNE, and CASC
 * Pittsburgh, PA: Pittsburgh Supercomputing Center

128.182.58.100: fuzz.psc.edu

Service area: NSFNET and PSC region
 * Pittsburgh, PA: Carnegie Mellon Electrical and Computer Engineering

ntp-1.ece.cmu.edu; ntp-2.ece.cmu.edu

Service Area: PREPNET and PSC region
 * Dallas, TX: Cox School of Business, Southern Methodist University

129.119.80.126: ntp.cox.smu.edu

Service Area: NSFNET and SESQUI region
 * Hughes Springs, TX: First National Bank

209.144.20.76: ntp.fnbhs.com

Service area: Northeast Texas
 * Houston, Tx: Baylor College of Medicine

128.249.1.10: ntp.tmc.edu

Service Area: NSFNET and SESQUI region
 * College Station, TX: Texas A&M University

165.91.52.110: ntp5.tamu.edu

Service area: NSFNET, SESQUI region, THEnet, and TAMUSDSN
 * Plano, TX: Greyware Automation Products

tick.greyware.com; tock.greyware.com

Service Area: South-Central U.S.
 * Blacksburg, VA: Virginia Tech Computing Center

ntp-1.vt.edu; ntp-2.vt.edu

Service Area: Southeast U.S.
 * Arlington, VA: Center for Seismic Studies

140.162.1.3: ntp.cmr.gov

Service Area: NSFNET and SURA region
 * Richland, WA: Washington State University

192.31.216.30: clock.tricity.wsu.edu

Service Area: NSFNET and NorthWestNet
 * Washington, U.S.: Mill Creek

time.ultimeth.net

Service Area: Northwest U.S.
 * Wisconsin, U.S.: Computer Science Department, University of Wisconsin-Madison

ntp1.cs.wisc.edu; ntp2.cs.wisc.edu; ntp3.cs.wisc.edu

Service Area: U.S. and any

South America

 * Buenos Aires, Argentina: Network Access Point

200.49.40.1: CNAME: tick.nap.com.ar

200.49.32.1: CNAME: tock.nap.com.ar

Service Area: Argentina
 * Buenos Aires, Argentina: Sinectis S.A.

time.sinectis.com.ar

Service Area: Argentina
 * Brazil: Brazilian Research Network

200.144.121.33: ntp.cais.rnp.br

Service Area: Brazil
 * Venezuela: VELUG, Grupo de Usuarios Linux de Venezuela

150.185.192.250: ntp.linux.org.ve

Service Area: Arica

Europe

 * Zurich, Switzerland: Swiss Fed. Inst. of Technology

129.132.98.11: bernina.ethz.ch

Service Area: Switzerland and Europe
 * Location: Copenhagen, Denmark, Europe

clock.netcetera.dk; clock2.netcetera.dk

Service area: Denmark, Scandinavia, and Northern Europe
 * Spain: Altea

slug.ctv.es

Service Area: Spain
 * Pieksamaki, Finland: Keski-Savon Oppimiskeskus

tick.keso.fi; tock.keso.fi

Service area: Finland
 * Meudon, France: Observatoire de Paris-Meudon

ntp.obspm.fr

Service Area: France and Europe
 * Lyon, France: CISM

ntp.univ-lyon1.fr

Service Area: France, Switzerland, Italy, and Europe
 * Paris, France: VIA, Ecole Centrale

138.195.130.70: ntp.via.ecp.fr

Service Area: France and Europe
 * Budapest, Hungary: KFKI Research Institute for Particle and Nuclear Physics

148.6.0.1: time.kfki.hu

Service Area: HUNGARNET
 * Italy: Net4u Srl, Vercelli, Italy

195.32.52.129: ntps.net4u.it

Service area: Italy
 * Oslo, Norway: University of Oslo

129.240.64.3: fartein.ifi.uio.no

Service Area: NORDUnet
 * Oslo, Norway: Alcanet International

time.alcanet.no

Service Area: Europe
 * Krakow, Poland: Academic Computer Centre

149.156.4.11: info.cyf-kr.edu.pl

Service Area: Poland and Europe
 * Lund, Sweden: Lund Institute of Technology

130.235.20.3: ntp.lth.se

Service Area: Sweden and NORDUnet
 * Ljubljana, Slovenia: Institute of Biophysics, University of Ljubljana

biofiz.mf.uni-lj.si 193.2.69.11

Service Area: Slovenia and Europe
 * Ljubljana, Slovenia: Hydrometeorological Institute of Slovenia

hmljhp.rzs-hm.si

Service Area: Slovenia and Europe
 * Ljubljana, Slovenia: Academic and Research Network of Slovenia

ntp1.arnes.si; ntp2.arnes.si

Service Area: Slovenia and Europe
 * Ljubljana, Slovenia: J. Stefan Institute

time.ijs.si

Service Area: Slovenia and Europe

British Isles

 * Dublin, Ireland: School of Mathematics, Trinity College

ntp.cs.tcd.ie; ntp.maths.tcd.ie; ntp.tcd.ie

Service Area: Ireland and U.K.
 * Glasgow, Scotland: Strathclyde University

ntp.cs.strath.ac.uk

Service Area: U.K., Europe, and any
 * Cambridge, U.K.

ntp0.uk.uu.net; ntp1.uk.uu.net;

ntp2.uk.uu.net

Service Area: UUNET (formerly known in the U.K. as PIPEX) and U.K.
 * Manchester, England: University of Manchester

ntp2a.mcc.ac.uk; ntp2b.mcc.ac.uk;

ntp2c.mcc.ac.uk; ntp2d.mcc.ac.uk

Service Area: U.K.
 * Buckinghamshire U.K.: Wibble U.K., Aylesbury

tick.tanac.net

Service area: U.K.

Asia

 * Moscow, Russia: Landau Institute for Theoretical Physics

193.233.9.7: ntp.landau.ac.ru

Service area: Russia
 * Russia: Pushchino (near Moscow)

194.149.67.130: ntp.psn.ru

Service area: Russia
 * Chernogolovka, Russia: Chernogolovka Scientific Center (near Moscow)

193.233.46.10: sign.chg.ru

Service Area: Russia

East Asia and Pacific Rim

 * Tokyo, Japan: Cyber Fleet, Inc.

203.139.30.195: ntp.cyber-fleet.net

Service Area: Japan and East Asia
 * Seoul, Korea: Inet, Inc.

time.nuri.net

Service Area: Korea, Japan, Hong Kong, and East Asia
 * Hamilton, New Zealand: The University of Waikato

truechimer.waikato.ac.nz; truechimer1.waikato.ac.nz;

truechimer2.waikato.ac.nz; truechimer3.waikato.ac.nz

Service Area: New Zealand
 * Singapore and the Philippines:

ntp.shim.org

Service Area: Singapore

Africa

 * Lagos, Nigeria: Supernet300

ntp.supernet300.com

Service Area: Western Africa (primarily Nigerian NITEL backbone)
 * Pietermaritzburg, South Africa: Natal University

143.128.82.200: ntp.cs.unp.ac.za

Service area: South Africa

Australia

 * Adelaide, South Australia: The University of Adelaide

129.127.28.4: augean.eleceng.adelaide.edu.au

129.127.40.3: ntp.adelaide.edu.au

203.21.37.18: ntp.saard.net

Service area: AARNet
 * Carlton, Victoria, Australia: eSec Limited

203.21.84.4: time.esec.com.au

Additional query words: w32time w32tm sntp

Keywords: kbproductlink kbinfo kbnetwork KB262680

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