[US-California]
clock.isc.org
clock.via.net
ntp-cup.external.hp.com
timekeeper.isi.edu
usno.pa-x.dec.com
ns.scruz.net
ntp.ucsd.edu
ntp1.mainecoon.com
ntp2.mainecoon.com

[US-Colorado]
navobs1.usnogps.navy.mil
navobs2.usnogps.navy.mil
utcnist.colorado.edu

[US-District of Columbia]
ntp2.usno.navy.mil
tick.usno.navy.mil

[US-Delaware]
ntp1.delmarva.com

[US-Georgia]
timex.peachnet.edu

[US-Illinois]
ntp-0.cso.uiuc.edu
ntp-1.cso.uiuc.edu
ntp-1.mcs.anl.gov
ntp-2.cso.uiuc.edu
ntp-2.mcs.anl.gov

[US-Indiana]
darkcity.cerias.purdue.edu
gilbreth.ecn.purdue.edu
harbor.ecn.purdue.edu
molecule.ecn.purdue.edu

[US-Kansas]
ntp1.kansas.net
ntp2.kansas.net

[US-Massachusetts]
bonehed.lcs.mit.edu
timeserver.cs.umb.edu

[US-Minnesota]
ns.nts.umn.edu
nss.nts.umn.edu

[US-Missouri]
navobs1.wustl.edu
everest.cclabs.missouri.edu

[US-North Carolina]
terrapin.csc.ncsu.edu

[US-Nevada]
cuckoo.nevada.edu

[US-New York]
ntp.ctr.columbia.edu
ntp0.cornell.edu
sundial.columbia.edu
timex.cs.columbia.edu

[US-Pennsylvania]
otc1.psu.edu
wwv.otc.psu.edu
clock.psu.edu
fuzz.psc.edu
ntp-1.ece.cmu.edu
ntp-2.ece.cmu.edu

[US-Texas]
ntp.fnbhs.com
ntp.tmc.edu
ntp5.tamu.edu

[US-Virginia]
ntp-2.vt.edu
ntp.cmr.gov

[US-Wisconsin]
ntp1.cs.wisc.edu
ntp2.cs.wisc.edu
ntp3.cs.wisc.edu

[SA-Argentina]
tick.nap.com.ar
time.sinectis.com.ar
tock.nap.com.ar

[OC-Australia]
ntp.cs.mu.OZ.AU
augean.eleceng.adelaide.edu.au
ntp.saard.net
time.esec.com.au

[SA-Brazil]
ntp.cais.rnp.br

[NA-Canada]
time.chu.nrc.ca
ntp1.cmc.ec.gc.ca
ntp2.cmc.ec.gc.ca
tick.utoronto.ca
time.nrc.ca
timelord.uregina.ca
tock.utoronto.ca

[EU-Switzerland]
swisstime.ethz.ch

[SA-Chile]
ntp.dgf.uchile.cl

[EU-Germany]
ntp0.fau.de
ntp1.fau.de
ntp2.fau.de
ntps1-0.cs.tu-berlin.de
ntps1-1.cs.tu-berlin.de
ptbtime1.ptb.de
ptbtime2.ptb.de
rustime01.rus.uni-stuttgart.de

[EU-Denmark]
clock.netcetera.dk
clock2.netcetera.dk

[EU-Estonia]
slug.ctv.es

[EU-Finland]
tick.keso.fi
tock.keso.fi

[EU-France]
ntp.obspm.fr
ntp.univ-lyon1.fr
ntp.via.ecp.fr

[AS-Hong Kong]
clock.cuhk.edu.hk

[EU-Hungary]
time.kfki.hu

[EU-Ireland]
ntp.maths.tcd.ie

[EU-Italy]
tempo.cstv.to.cnr.it
ntps.net4u.it

[AS-Japan]
clock.nc.fukuoka-u.ac.jp
clock.tl.fukuoka-u.ac.jp
ntp.cyber-fleet.net

[AS-Korea]
time.nuri.net

[NA-Mexico]
ntp2a.audiotel.com.mx
ntp2b.audiotel.com.mx
ntp2c.audiotel.com.mx

[AF-Nigeria]
ntp.supernet300.com

[EU-Netherlands]
ntp0.nl.net

[EU-Norway]
fartein.ifi.uio.no
time.alcanet.no

[EU-Poland]
vega.cbk.poznan.pl
info.cyf-kr.edu.pl

[EU-Russia]
ntp.psn.ru
sign.chg.ru

[EU-Sweden]
time1.stupi.se
time2.stupi.se
ntp.lth.se

[AS-Singapore]
ntp.shim.org

[EU-Slovenia]
biofiz.mf.uni-lj.si
ntp1.arnes.si
ntp2.arnes.si
time.ijs.si

[EU-United Kingdom]
chronos.csr.net
ntp.cs.strath.ac.uk
ntp0.uk.uu.net
ntp1.uk.uu.net
ntp2.uk.uu.net
ntp2a.mcc.ac.uk
ntp2b.mcc.ac.uk
ntp2c.mcc.ac.uk
ntp2d.mcc.ac.uk
tick.tanac.net

[SA-Venezuela]
ntp.linux.org.ve

[AF-South Africa]
ntp.cs.unp.ac.za