List of Top Public Time Servers

Top_Public_Time_Servers.md

Google Public NTP [AS15169]:

time.google.com

time1.google.com

time2.google.com

time3.google.com

time4.google.com

time.android.com

public Amazon Time Sync Service [AS16509, AS14618, AS399991]:

time.aws.com

amazon.pool.ntp.org

0.amazon.pool.ntp.org

1.amazon.pool.ntp.org

2.amazon.pool.ntp.org

3.amazon.pool.ntp.org

Cloudflare NTP [AS13335]:

time.cloudflare.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-macos.apple.com

time-ios.apple.com

time1.apple.com

time2.apple.com

time3.apple.com

time4.apple.com

time5.apple.com

time6.apple.com

time7.apple.com

time.euro.apple.com

DEC/Compaq/HP:

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

time-e-b.nist.gov

time-e-g.nist.gov

time-e-wwv.nist.gov

time-nw.nist.gov

time-a.nist.gov

time-b.nist.gov

utcnist.colorado.edu

utcnist2.colorado.edu

VNIIFTRI:

Stratum 1:

ntp1.vniiftri.ru

ntp2.vniiftri.ru

ntp3.vniiftri.ru

ntp4.vniiftri.ru

ntp.sstf.nsk.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:

ntp0.ntp-servers.net

ntp1.ntp-servers.net

ntp2.ntp-servers.net

ntp3.ntp-servers.net

ntp4.ntp-servers.net

ntp5.ntp-servers.net

ntp6.ntp-servers.net

ntp7.ntp-servers.net

Stratum 1:

ntp1.stratum1.ru

ntp2.stratum1.ru

ntp3.stratum1.ru

ntp4.stratum1.ru

ntp5.stratum1.ru

Stratum 2:

ntp1.stratum2.ru Москва

ntp2.stratum2.ru

ntp3.stratum2.ru

ntp4.stratum2.ru

ntp5.stratum2.ru

Stratum1:

Stratum 1:

stratum1.net

time.in.ua:

Stratum 1:

ntp.time.in.ua

ntp2.time.in.ua

Stratum 2:

ntp3.time.in.ua

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

ITAEC [AS41783]:

ntp.psn.ru

RSU [AS47124]:

Stratum 1:

ntp.rsu.edu.ru

National Institute of Information and Communications Technology [AS9355]:

ntp.nict.jp

NTT [AS2914]:

x.ns.gin.ntt.net

y.ns.gin.ntt.net

HE.net Public Stratum 1 NTP servers [AS6939]:

clock.sjc.he.net

clock.fmt.he.net

clock.nyc.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

QiX NTP [AS14086]:

ntp.qix.ca

ntp1.qix.ca

ntp2.qix.ca

YYCIX NTP [AS396515]:

ntp.yycix.ca

MSK-IX NTP [AS43832]:

Stratum 1:

ntp.ix.ru

Hetzner Online [AS24940]:

ntp1.hetzner.de

ntp2.hetzner.de

ntp3.hetzner.de

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

Chinese Academy of Sciences Nation Time Service Center [AS4808, AS9808, AS23724]:

ntp.ntsc.ac.cn

Nat Morris [AS30746]:

Stratum 1:

ntp.nat.ms

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

north-america.pool.ntp.org

0.north-america.pool.ntp.org

1.north-america.pool.ntp.org

2.north-america.pool.ntp.org

3.north-america.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.smartos.pool.ntp.org

1.smartos.pool.ntp.org

2.smartos.pool.ntp.org

3.smartos.pool.ntp.org

0.android.pool.ntp.org

1.android.pool.ntp.org

2.android.pool.ntp.org

3.android.pool.ntp.org

0.amazon.pool.ntp.org

1.amazon.pool.ntp.org

2.amazon.pool.ntp.org

3.amazon.pool.ntp.org

0.ubnt.pool.ntp.org

1.ubnt.pool.ntp.org

2.ubnt.pool.ntp.org

3.ubnt.pool.ntp.org

Other:

.mil:

tick.usno.navy.mil

tock.usno.navy.mil

ntp2.usno.navy.mil

.edu:

utcnist.colorado.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

bonehed.lcs.mit.edu

level1e.cs.unc.edu

tick.ucla.edu

tick.uh.edu

.com:

ntpstm.netbone-digital.com

nist1.symmetricom.com

ntp.quintex.com

ntp1.conectiv.com

tock.usshc.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

.org:

ntp1.ona.org

ntp.your.org

ntp.mrow.org

.de:

time.fu-berlin.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

.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

http://time.in.ua/

https://www.chrony.eu/status

https://www.ntp-server.de/ntp-server-deutschland/

https://www.ntp-server.de/ntp-server-oesterreich/

https://www.ntp-server.de/ntp-server-schweiz/

https://www.he.net/adm/ntp.html

I am trying to connect to some stratum 1 international time servers (currently located in the US), but it seems I am not reaching any of them. I was able to connect to ones in the US. Does anyone know why this may be happening?

NTP / NTS server free to use worldwide (better performance for western Europe), located in France, stratum-2 :
ntp.viarouge.net

see its info page @ http://ntp.viarouge.net

Great list. Would be really helpful to know which entries hold to the leap smearing standard. Regular NTP and smeared servers should not be mixed together.

https://developers.cloudflare.com/time-services/ntp/ [no smearing]
https://developers.google.com/time/smear [smearing]
https://engineering.fb.com/2020/03/18/production-engineering/ntp-service/ [smearing]

Regardless of smear, if you're using NTP to sync to outside sources and expect 100% accuracy all the time, you've misunderstood the concept entirely. You should probably be using local time servers and, depending on your needs, something like the Precision Time Protocol instead. https://people.cs.rutgers.edu/~pxk/417/notes/ptp.html

National Institute of Information and Communications Technology, Japan has a NTP server at

ntp.nict.jp

Source: https://www.nict.go.jp/en/sts/ntp.html

PS, my Brother printer connects to sntp.brother.com for NTP which appears to just CNAME to the above mentioned NTP Server

the FAQ section of NICT's NTP server also directs you to Internet Multifeed Co. which also runs a few NTP servers
https://www.mfeed.ad.jp/ntp/detail.html

ntp.jst.mfeed.ad.jp

ntp1.jst.mfeed.ad.jp
ntp2.jst.mfeed.ad.jp
ntp3.jst.mfeed.ad.jp

ntp1.v6.mfeed.ad.jp
ntp2.v6.mfeed.ad.jp
ntp3.v6.mfeed.ad.jp

Croatia .hr:

Stratum 1
ntp.hr dynamic IP
time1.ntp.hr 161.53.78.71
time2.ntp.hr 161.53.78.72

Stratum 2
os.ntp.carnet.hr Osijek
ri.ntp.carnet.hr Rijeka
st.ntp.carnet.hr Split
zg1.ntp.carnet.hr Zagreb
zg2.ntp.carnet.hr Zagreb

hk:
stdtime.gov.hk

United Kingdom Stratum 1
Some NTP below maybe restricted to UK / Ireland IPs so if you in BST/GMT timezone you should be fine.

http://leobodnar.com/LeoNTP

ntp5.leontp.com is located near Leeds, UK http://leobodnar.com/LeoNTP
ntp6.leontp.com UK http://leobodnar.com/LeoNTP
ntp7.leontp.com UK http://leobodnar.com/LeoNTP
ntp8.leontp.com UK http://leobodnar.com/LeoNTP
ntp9.leontp.com UK http://leobodnar.com/LeoNTP

timekeeper.webwiz.net  is located near Bournemouth, UK https://www.webwiz.uk/kb/web-hosting/ntp-time-service.htm
ntp.theitman.uk  is located near Mansfield, UK - https://ntp.theitman.uk
eshail.batc.org.uk Cornwall, UK - https://eshail.batc.org.uk/ntp

leontp.ccgs.wa.edu.au is located in Claremont, Western Australia http://leobodnar.com/LeoNTP

Brazil .br:

#https://ntp.br/

Official Brazilian NTP Servers:

a.st1.ntp.br  200.160.7.186 / 2001:12ff:0:7::186
b.st1.ntp.br  201.49.148.135
c.st1.ntp.br  200.186.125.195
d.st1.ntp.br  200.20.186.76	
a.ntp.br      200.160.0.8 / 2001:12ff::8
b.ntp.br      200.189.40.8 / 2001:12f8:9:1::8
c.ntp.br      200.192.232.8 / 2001:12f8:b:1::8
gps.ntp.br    200.160.7.193 / 2001:12ff:0:7::193

Official Brazilian NTS-Enabled Servers:

a.st1.ntp.br  200.160.7.186 / 2001:12ff:0:7::186
b.st1.ntp.br  201.49.148.135
c.st1.ntp.br  200.186.125.195
d.st1.ntp.br  200.20.186.76
gps.ntp.br    200.160.7.193 / 2001:12ff:0:7::193

Ubiquiti time servers

0.ubnt.pool.ntp.org
1.ubnt.pool.ntp.org
2.ubnt.pool.ntp.org
3.ubnt.pool.ntp.org

Thanks!

Apple NTP server https://support.apple.com/en-us/101555

time-ios.apple.com
time.apple.com
time-macos.apple.com

time.android.com

now appears to be used by default in Android 14.

You can see it with adb.exe shell dumpsys time_detector

Apple NTP server https://support.apple.com/en-us/101555

time-ios.apple.com
time.apple.com
time-macos.apple.com

Thanks!

time.android.com

now appears to be used by default in Android 14.

You can see it with adb.exe shell dumpsys time_detector

Thanks!

Brazil .br:

#https://ntp.br/

Official Brazilian NTP Servers:

a.st1.ntp.br  200.160.7.186 / 2001:12ff:0:7::186
b.st1.ntp.br  201.49.148.135
c.st1.ntp.br  200.186.125.195
d.st1.ntp.br  200.20.186.76	
a.ntp.br      200.160.0.8 / 2001:12ff::8
b.ntp.br      200.189.40.8 / 2001:12f8:9:1::8
c.ntp.br      200.192.232.8 / 2001:12f8:b:1::8
gps.ntp.br    200.160.7.193 / 2001:12ff:0:7::193

Official Brazilian NTS-Enabled Servers:

a.st1.ntp.br  200.160.7.186 / 2001:12ff:0:7::186
b.st1.ntp.br  201.49.148.135
c.st1.ntp.br  200.186.125.195
d.st1.ntp.br  200.20.186.76
gps.ntp.br    200.160.7.193 / 2001:12ff:0:7::193

Thanks!

United Kingdom Stratum 1 Some NTP below maybe restricted to UK / Ireland IPs so if you in BST/GMT timezone you should be fine.

http://leobodnar.com/LeoNTP

ntp5.leontp.com is located near Leeds, UK http://leobodnar.com/LeoNTP
ntp6.leontp.com UK http://leobodnar.com/LeoNTP
ntp7.leontp.com UK http://leobodnar.com/LeoNTP
ntp8.leontp.com UK http://leobodnar.com/LeoNTP
ntp9.leontp.com UK http://leobodnar.com/LeoNTP

timekeeper.webwiz.net  is located near Bournemouth, UK https://www.webwiz.uk/kb/web-hosting/ntp-time-service.htm
ntp.theitman.uk  is located near Mansfield, UK - https://ntp.theitman.uk
eshail.batc.org.uk Cornwall, UK - https://eshail.batc.org.uk/ntp

leontp.ccgs.wa.edu.au is located in Claremont, Western Australia http://leobodnar.com/LeoNTP

Thanks!

Croatia .hr:

Stratum 1 ntp.hr dynamic IP time1.ntp.hr 161.53.78.71 time2.ntp.hr 161.53.78.72

Stratum 2 os.ntp.carnet.hr Osijek ri.ntp.carnet.hr Rijeka st.ntp.carnet.hr Split zg1.ntp.carnet.hr Zagreb zg2.ntp.carnet.hr Zagreb

Thanks!

National Institute of Information and Communications Technology, Japan has a NTP server at

ntp.nict.jp

Source: https://www.nict.go.jp/en/sts/ntp.html

PS, my Brother printer connects to sntp.brother.com for NTP which appears to just CNAME to the above mentioned NTP Server

the FAQ section of NICT's NTP server also directs you to Internet Multifeed Co. which also runs a few NTP servers https://www.mfeed.ad.jp/ntp/detail.html

ntp.jst.mfeed.ad.jp

ntp1.jst.mfeed.ad.jp
ntp2.jst.mfeed.ad.jp
ntp3.jst.mfeed.ad.jp

ntp1.v6.mfeed.ad.jp
ntp2.v6.mfeed.ad.jp
ntp3.v6.mfeed.ad.jp

Thanks!

Chinese Academy of Sciences Nation Time Service Center ntp.ntsc.ac.cn (AS4808, AS9808, AS23724)

Thanks!

kindle.time.amazon.com
kindle-time.amazon.com

Used by Amazon Kids Tablets.