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Network Time Protocol

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The Network Time Protocol (NTP) is a protocol for distributing the Coordinated Universal Time (UTC) by synchronizing the clocks of computer systems over IP networks.

NTP is one of the oldest Internet Protocols still in use (since before 1985) and uses UDP port 123.


  • Mills, David L.. Computer Network Time Synchronization: The Network Time Protocol. Taylor & Francis / CRC Press. ISBN 0849358051

Other websites

Other time synchronization protocols