time.nist.gov
clock.via.net
timekeeper.isi.edu
ntp.lth.se
ntp.saard.net
ntp.cpsc.ucalgary.ca
ntp.tuxfamily.net
zg1.ntp.carnet.hr
time.kfki.hu
ntp.maths.tcd.ie
ntps.net4u.it
ntp.public.otago.ac.nz
