time.google.com
time1.google.com
time2.google.com
time3.google.com
time4.google.com
time.android.com
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
time.cloudflare.com
time.facebook.com
time1.facebook.com
time2.facebook.com
time3.facebook.com
time4.facebook.com
time5.facebook.com
time.windows.com
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
clepsydra.dec.com/clepsydra.labs.hp.com/clepsydra.hpl.hp.com/usno.labs.hp.com
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
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
ntp21.vniiftri.ru
ntp.mobatime.ru
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
ntp1.stratum1.ru
ntp2.stratum1.ru
ntp3.stratum1.ru
ntp4.stratum1.ru
ntp5.stratum1.ru
ntp1.stratum2.ru Москва
ntp2.stratum2.ru
ntp3.stratum2.ru
ntp4.stratum2.ru
ntp5.stratum2.ru
stratum1.net
ntp.time.in.ua
ntp2.time.in.ua
ntp3.time.in.ua
ntp.ru
ts1.aco.net
ts2.aco.net
ntp1.net.berkeley.edu
ntp2.net.berkeley.edu
ntp.gsu.edu
tick.usask.ca
tock.usask.ca
ntp.nsu.ru
ntp.psn.ru
ntp.rsu.edu.ru
ntp.nict.jp
x.ns.gin.ntt.net
y.ns.gin.ntt.net
clock.sjc.he.net
clock.fmt.he.net
clock.nyc.he.net
ntp.fiord.ru
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
ntp.qix.ca
ntp1.qix.ca
ntp2.qix.ca
ntp.yycix.ca
ntp.ix.ru
ntp1.hetzner.de
ntp2.hetzner.de
ntp3.hetzner.de
time-a.as43289.net
time-b.as43289.net
time-c.as43289.net
ntp.ripe.net
clock.isc.org (prev ntp.isc.org)
ntp.time.nl (ntp1.time.nl)
ntp0.as34288.net
ntp1.as34288.net
ntp1.jst.mfeed.ad.jp
ntp2.jst.mfeed.ad.jp
ntp3.jst.mfeed.ad.jp
ntp.ntsc.ac.cn
ntp.nat.ms
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
tick.usno.navy.mil
tock.usno.navy.mil
ntp2.usno.navy.mil
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
ntpstm.netbone-digital.com
nist1.symmetricom.com
ntp.quintex.com
ntp1.conectiv.com
tock.usshc.com
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.ona.org
ntp.your.org
ntp.mrow.org
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
chime1.surfnet.nl
ntp.vsl.nl
asynchronos.iiss.at
ntp.nic.cz
time.ufe.cz
ntp.fizyka.umk.pl
tempus1.gum.gov.pl
tempus2.gum.gov.pl
ntp1.usv.ro
ntp3.usv.ro
timehost.lysator.liu.se
time1.stupi.se
time.nrc.ca
clock.uregina.ca
cronos.cenam.mx
ntp.lcf.mx
hora.roa.es
minuto.roa.es
ntp1.inrim.it
ntp2.inrim.it
ntp1.oma.be
ntp2.oma.be
ntp.atomki.mta.hu
ntp.i2t.ehu.eus
ntp.neel.ch
ntp.neu.edu.cn
ntp.nict.jp
ntps1.pads.ufrj.br
ntp.shoa.cl
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://www.ntp-server.de/ntp-server-deutschland/
https://www.ntp-server.de/ntp-server-oesterreich/
Thanks!