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The USNO websites aa.usno.navy.mil, ad.usno.navy.mil, aristarchus.usno.navy.mil, maia.usno.navy.mil, rorf.usno.navy.mil, toshi.usno.navy.mil, and tycho.usno.navy.mil are undergoing modernization efforts. The expected completion of the work and the estimated return of service is Fall 2020, subject to change due to potential impacts of COVID-19.
 

DoD Customers

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

Authenticated NTP

USNO offers authenticated NTP service to DoD and U.S. Government agencies operatiing on the NIPR and SIPR networks. To obtain information on the servers and/or a key for authentication, please provide the following information in the form located at the following link, selecting NTP as the Subject: Time Help.
  • POC Name:
  • POC Phone Number:
  • POC Email (prefer unclass):
  • Organization:
  • DoD organization you're supporting (if different):
  • What keys are needed (NIPR, SIPR, or both):
  • What type of key (MD5, SHA1):
USNO Master Clock Time
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