clock.psu.edu
augean.eleceng.adelaide.edu.au
ntp.lth.se
mizbeaver.udel.edu
ntp.cmr.gov
ntp.nasa.gov
ntp.psn.ru
ntp.tcp-udp.net
ntp.via.ecp.fr
ntp0.cornell.edu
ntp1.uk.uu.net
ntp-2.ece.cmu.edu
ntp-p1.obspm.fr
ntps1-1.cs.tu-berlin.de
ntps1-2.uni-erlangen.de
otc1.psu.edu
ptbtime2.ptb.de
ri.ntp.carnet.hr
rolex.usg.edu
sizif.mf.uni-lj.si
sundial.columbia.edu
tick.keso.fi