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DoD ntp Customers

We strongly suggest that DoD users NOT use the following servers:
DoD users should contact USNO at the link below for information on its exclusive DoD NTP servers.

Authenticated NTP

USNO offers authenticated NTP service to DoD and U.S. Government agencies operating on the NIPR and SIPR networks. To obtain information on the servers and/or a key for authentication, please provide the following information in a signed email to: 
  • 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 (SHA256, SHA1, MD5):​
    USNO highly recommends SHA256 keys in 64-character hex format.  Legacy systems not supporting SHA256 may request SHA1 or MD5 keys, but be aware that these less secure formats may soon be deprecated.


Commander, Naval Meteorology and Oceanography Command | 1100 Balch Blvd. | Stennis Space Center, Mississippi 39529

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