Public Time Servers use the Network Time Protocol (NTP) is a protocol for synchronizing the clocks of computer systems and networking equipment over packet-switched, variable-latency data networks. It is designed particularly to resist the effects of variable latency to keep all equipment in sync.

Below is a list of public time servers available for use.

ntp2.usno.navy.mil (192.5.41.209) USNO, Washington, DC

tock.usno.navy.mil (192.5.41.41) USNO, Washington, DC

tick.usno.navy.mil (192.5.41.40) USNO, Washington, DC

time-a.nist.gov (129.6.15.28) NIST, Gaithersburg, Maryland

time-b.nist.gov (129.6.15.29) NIST, Gaithersburg, Maryland

time.nist.gov (192.43.244.18) NCAR, Boulder, Colorado

ntp-s1.cise.ufl.edu (128.227.205.3) University of Florida, Gainesville, FL