USNO NTP Network Time Servers

WE STRONGLY RECOMMEND THAT YOU CHOOSE ONE OR MORE SERVERS CLOSE TO YOU FOR REDUNDANCY.


Authenticated NTP

USNO offers authenticated NTP service to DoD and U.S. Government agencies operating on the NIPR and SIPR Networks. To obtain a key for authentication please give, at minimum, the following information to the USNO NTP administrators.


We strongly suggest that DOD users not use the following servers:

  • tick.usno.navy.mil
  • tock.usno.navy.mil
  • ntp2.usno.navy.mil
  • tick.usnogps.navy.mil
  • tock.usnogps.navy.mil

  • NIPRNET Servers

  • ntp.usno.navy.mil
  • Location: Time Service Dept., U.S. Naval Observatory, Washington, DC
    Synchronization: NTP V4 primary (USNO Master Clock H-masers )

  • ntp.usnogps.navy.mil
  • Location: US Naval Observatory Alternate Master Clock, Colorado Springs, CO
    Synchronization: NTP V4 primary (USNO Master Clock H-masers)



    For further information contact
    Time Service Dept., USNO

    Back to Time Service Home Page
    "The inaudible and noiseless foot of Time." --W. S.