Network Time Protocol
Internet protocol
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The Network Time Protocol is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks. In operation since before 1985, NTP is one of the oldest Internet protocols in current use.... Wikipedia
Ports: port 123
Developed by: David L. Mills, Harlan Stenn, Network Time Foundation
International standard: RFC 5905
Introduced: 1985; 39 years ago