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US Eastern Time Zone

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Location: Time Service Dept., U.S. Naval Observatory, Washington, DC
Synchronization: NTP V4 primary (USNO Master Clock H-masers)
Access Policy: open access for MIL, GOV, and other stratum 2 servers.

Location: University of Florida, Gainesville, FL
Synchronization: NTP V4 primary (GPS)
Access Policy: open access for stratum 2 servers and UFL clients,others by arrangement

Location: Colby College, Waterville, ME
Synchronization: NTP V4 primary (GPS)
Access Policy: open access for stratum 2 servers and Colby clients,others by arrangement

Location: OARnet, Ohio State University, Columbus, Ohio
Synchronization: NTP V4 primary (GPS)
Access Policy: open access for stratum 2 servers and OARnet, others by arrangement

Location: Columbia University, New York City
Synchronization: NTP V4 primary (GPS)
Access Policy: open access for stratum 2 servers and CU, others by arrangement

Location: Georgia Institute of Technology, Atlanta, Georgia
Synchronization: NTP V4 primary (GPS)
Access Policy: open access for stratum 2 servers and GATECH clients, others by arrangement

USNO Master Clock Time
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