time.nist.gov

ntp2.usno.navy.mil

time-a.nist.gov

time-b.nist.gov

time-a.timefreq.bldrdoc.gov

time-b.timefreq.bldrdoc.gov

bitsy.mit.edu

canon.inria.fr

chronos.univ-rennes1.fr

ncnoc.ncren.net

navobs1.gatech.edu

ntp.cs.mu.OZ.AU

ntp.dgf.uchile.cl

ntps1-0.cs.tu-berlin.de

ntps1-1.rz.Uni-Osnabrueck.DE

ntps1-1.uni-erlangen.de

ntps1-2.uni-erlangen.de

otc1.psu.edu

rackety.udel.edu

tempo.cstv.to.cnr.it

tick.mit.edu

tick.ucla.edu

tick.uh.edu

time.ien.it

time.service.uit.no

umd1.umd.edu

utcnist.microsoft.com

wave.mbari.org

wwvb.erg.sri.com