Public NTP Servers with open Access policy

Cloudflare NTP [AS13335]:

• time.cloudflare.com

Google Public NTP [AS15169]:

• time.google.com

• time1.google.com

• time2.google.com

• time3.google.com

• time4.google.com

Facebook NTP [AS32934]:

• time.facebook.com

• time1.facebook.com

• time2.facebook.com

• time3.facebook.com

• time4.facebook.com

• time5.facebook.com

Microsoft NTP server [AS8075]:

• time.windows.com

Apple NTP server [AS714, AS6185]:

• time.apple.com

• time.euro.apple.com

DEC/Compaq/HP:

• clepsydra.dec.com/clepsydra.labs.hp.com/clepsydra.hpl.hp.com

NIST Internet Time Service (ITS) [AS49, AS104]:

• time-a-g.nist.gov

• time-b-g.nist.gov

• time-c-g.nist.gov

• time-d-g.nist.gov

• time-a-wwv.nist.gov

• time-b-wwv.nist.gov

• time-c-wwv.nist.gov

• time-d-wwv.nist.gov

• time-a-b.nist.gov

• time-b-b.nist.gov

• time-c-b.nist.gov

• time-d-b.nist.gov

• time.nist.gov

• utcnist.colorado.edu

• utcnist2.colorado.edu

NTT (AS2914):

• x.ns.gin.ntt.net

• y.ns.gin.ntt.net

Hetzner Online (AS24940):

• ntp1.hetzner.de

• ntp2.hetzner.de

• ntp3.hetzner.de

VNIIFTRI:

Stratum 1:

• ntp1.vniiftri.ru

• ntp2.vniiftri.ru

• ntp3.vniiftri.ru

• ntp4.vniiftri.ru

• ntp1.niiftri.irkutsk.ru

• ntp2.niiftri.irkutsk.ru

• vniiftri.khv.ru

• vniiftri2.khv.ru

Stratum 2:

• ntp21.vniiftri.ru

Mobatime:

Stratum 1:

• ntp.mobatime.ru

NTP SERVERS:

Stratum 1:

• ntp1.stratum1.ru

• ntp2.stratum1.ru

• ntp3.stratum1.ru

• ntp4.stratum1.ru

• ntp5.stratum1.ru

• ntp.time.in.ua

• ntp2.time.in.ua

Stratum 2:

• ntp2.stratum2.ru

• ntp3.stratum2.ru

• ntp4.stratum2.ru

• ntp5.stratum2.ru

• ntp3.time.in.ua

Stratum1:

Stratum 1:

• stratum1.net

Company Delfa Co. Ltd. [AS8915]:

• ntp.ru

ACO.net [AS1853]:

• ts1.aco.net

• ts2.aco.net

Berkeley [AS25]:

Stratum 1:

• ntp1.net.berkeley.edu

• ntp2.net.berkeley.edu

Georgia State University [AS10631]:

• ntp.gsu.edu

University of Saskatchewan [AS22950]:

• tick.usask.ca

• tock.usask.ca

NSU [AS3335]:

Stratum 2:

• ntp.nsu.ru

RSU [AS47124]:

Stratum 1:

• ntp.rsu.edu.ru

National Institute of Information and Communications Technology [AS9355]:

• ntp.nict.jp

HE.net [AS6939]:

• clock.nyc.he.net

• clock.sjc.he.net

TRC Fiord [AS28917]:

• ntp.fiord.ru

Netnod NTP service [AS57021]:

Stratum 1:

Göteborg:

• gbg1.ntp.se

• gbg2.ntp.se

Malmö:

• mmo1.ntp.se

• mmo2.ntp.se

Stockholm:

• sth1.ntp.se

• sth2.ntp.se

Sundsvall:

• svl1.ntp.se

• svl2.ntp.se

Anycast address for nearest NTP server of the above:

• ntp.se

YYCIX NTP [AS396515]:

• ntp.yycix.ca

MSK-IX NTP [AS43832]:

Stratum 1:

• ntp.ix.ru

Trabia-Network [AS43289]:

• time-a.as43289.net

• time-b.as43289.net

• time-c.as43289.net

RIPE [AS3333]:

• ntp.ripe.net

Internet Systems Consortium [AS1280]:

• clock.isc.org (prev ntp.isc.org)

TimeNL/SIDN Labs [AS1140]:

• ntp.time.nl (ntp1.time.nl)

Kantonsschule Zug [AS34288]:

• ntp0.as34288.net

• ntp1.as34288.net

INTERNET MULTIFEED CO. [AS7521]:

• ntp1.jst.mfeed.ad.jp

• ntp2.jst.mfeed.ad.jp

• ntp3.jst.mfeed.ad.jp

Android OS List :

• 0.android.pool.ntp.org

• 1.android.pool.ntp.org

• 2.android.pool.ntp.org

• 3.android.pool.ntp.org

NTP Pool:

• pool.ntp.org

• 0.pool.ntp.org

• 1.pool.ntp.org

• 2.pool.ntp.org

• 3.pool.ntp.org

• europe.pool.ntp.org

• 0.europe.pool.ntp.org

• 1.europe.pool.ntp.org

• 2.europe.pool.ntp.org

• 3.europe.pool.ntp.org

• asia.pool.ntp.org

• 0.asia.pool.ntp.org

• 1.asia.pool.ntp.org

• 2.asia.pool.ntp.org

• 3.asia.pool.ntp.org

• ru.pool.ntp.org

• 0.ru.pool.ntp.org

• 1.ru.pool.ntp.org

• 2.ru.pool.ntp.org

• 3.ru.pool.ntp.org

• 0.gentoo.pool.ntp.org

• 1.gentoo.pool.ntp.org

• 2.gentoo.pool.ntp.org

• 3.gentoo.pool.ntp.org

• 0.arch.pool.ntp.org

• 1.arch.pool.ntp.org

• 2.arch.pool.ntp.org

• 3.arch.pool.ntp.org

• 0.fedora.pool.ntp.org

• 1.fedora.pool.ntp.org

• 2.fedora.pool.ntp.org

• 3.fedora.pool.ntp.org

• 0.opensuse.pool.ntp.org

• 1.opensuse.pool.ntp.org

• 2.opensuse.pool.ntp.org

• 3.opensuse.pool.ntp.org

• 0.centos.pool.ntp.org

• 1.centos.pool.ntp.org

• 2.centos.pool.ntp.org

• 3.centos.pool.ntp.org

• 0.debian.pool.ntp.org

• 1.debian.pool.ntp.org

• 2.debian.pool.ntp.org

• 3.debian.pool.ntp.org

• 0.askozia.pool.ntp.org

• 1.askozia.pool.ntp.org

• 2.askozia.pool.ntp.org

• 3.askozia.pool.ntp.org

• 0.freebsd.pool.ntp.org

• 1.freebsd.pool.ntp.org

• 2.freebsd.pool.ntp.org

• 3.freebsd.pool.ntp.org

• 0.netbsd.pool.ntp.org

• 1.netbsd.pool.ntp.org

• 2.netbsd.pool.ntp.org

• 3.netbsd.pool.ntp.org

• 0.openbsd.pool.ntp.org

• 1.openbsd.pool.ntp.org

• 2.openbsd.pool.ntp.org

• 3.openbsd.pool.ntp.org

• 0.dragonfly.pool.ntp.org

• 1.dragonfly.pool.ntp.org

• 2.dragonfly.pool.ntp.org

• 3.dragonfly.pool.ntp.org

• 0.pfsense.pool.ntp.org

• 1.pfsense.pool.ntp.org

• 2.pfsense.pool.ntp.org

• 3.pfsense.pool.ntp.org

• 0.opnsense.pool.ntp.org

• 1.opnsense.pool.ntp.org

• 2.opnsense.pool.ntp.org

• 3.opnsense.pool.ntp.org

• 0.amazon.pool.ntp.org

• 1.amazon.pool.ntp.org

• 2.amazon.pool.ntp.org

• 3.amazon.pool.ntp.org

Other:

.mil:

• tick.usno.navy.mil

• tock.usno.navy.mil

• ntp2.usno.navy.mil

.edu:

• utcnist2.colorado.edu

• timekeeper.isi.edu

• rackety.udel.edu

• mizbeaver.udel.edu

• otc1.psu.edu

• gnomon.cc.columbia.edu

• navobs1.gatech.edu

• navobs1.wustl.edu

• now.okstate.edu

• ntp.colby.edu

• ntp-s1.cise.ufl.edu

.com:

• ntpstm.netbone-digital.com

• nist1.symmetricom.com

.net:

• t2.timegps.net

• gps.layer42.net

• ntp-ca.stygium.net

• sesku.planeacion.net

• ntp0.nl.uu.net

• ntp1.nl.uu.net

• navobs1.oar.net

• ntp-galway.hea.net

• ntp1.wirehive.net

• ntp2.wirehive.net

• ntp3.wirehive.net

.org:

• ntp1.ona.org

.de:

• time.fu-berlin.de

• atom.uhr.de

• ntps1-0.cs.tu-berlin.de

• ntps1-1.cs.tu-berlin.de

• ntps1-0.uni-erlangen.de

• ntps1-1.uni-erlangen.de

• ntp1.fau.de

• ntp2.fau.de

• ntp.dianacht.de

• zeit.fu-berlin.de

• ptbtime1.ptb.de

• ptbtime2.ptb.de

• rustime01.rus.uni-stuttgart.de

• rustime02.rus.uni-stuttgart.de

.nl:

• chime1.surfnet.nl

• ntp.vsl.nl

.at:

• asynchronos.iiss.at

.cz:

• ntp.nic.cz

• time.ufe.cz

.pl:

• ntp.fizyka.umk.pl

• tempus1.gum.gov.pl

• tempus2.gum.gov.pl

• tempus1.gum.gov.pl

• tempus2.gum.gov.pl

.ro:

• ntp1.usv.ro

• ntp3.usv.ro

.se:

• timehost.lysator.liu.se

• time1.stupi.se

.ca:

• time.nrc.ca

• clock.uregina.ca

.mx:

• cronos.cenam.mx

• ntp.lcf.mx

.es:

• hora.roa.es

• minuto.roa.es

.it:

• ntp1.inrim.it

• ntp2.inrim.it

.be:

• ntp1.oma.be

• ntp2.oma.be

.hu:

• ntp.atomki.mta.hu

.eus:

• ntp.i2t.ehu.eus

.ch:

• ntp.neel.ch

.cn:

• ntp.neu.edu.cn

.jp:

• ntp.nict.jp

.br:

• ntps1.pads.ufrj.br

.cl:

• ntp.shoa.cl

.int:

• time.esa.int

• time1.esa.int

http://support.ntp.org/bin/view/Servers/StratumOneTimeServers

http://support.ntp.org/bin/view/Servers/StratumTwoTimeServers

http://support.ntp.org/bin/view/Servers/NTPPoolServers

http://www.pool.ntp.org/zone/@

http://www.pool.ntp.org/zone/asia

http://www.pool.ntp.org/zone/europe

http://www.pool.ntp.org/zone/north-america

http://www.pool.ntp.org/zone/oceania

http://www.pool.ntp.org/zone/south-america

https://time.nl/

https://time.nl/index_en.html

https://insights.sei.cmu.edu/sei_blog/2017/04/best-practices-for-ntp-services.html

http://support.ntp.org/bin/view/Servers/RulesOfEngagement