NTP RFCs

NTP, Network Time Protocol, is a networking protocol. Its purpose is to syrchronise computers’ clocks over a network.

Version 4 RFCs

• RFC 5905 — Network Time Protocol Version 4: Protocol and Algorithms Specification (June 2010)
• RFC 7822 — Network Time Protocol Version 4 (NTPv4) Extension Fields (March 2016)
• RFC 8573 — Message Authentication Code for the Network Time Protocol (June 2019)

Version 3 RFC

• RFC 1305 — Network Time Protocol (Version 3) Specification, Implementation and Analysis (Obsolete) (March 1992)

Version 2 RFC

This one is only available as a PDF.

• RFC 1119 — Network Time Protocol (Version 2) Specification and Implementation (View as PDF) (Obsolete) (September 1989)

Version 1 RFCs

• RFC 958 — Network Time Protocol (Obsolete) (September 1985)
• RFC 1059 — Network Time Protocol specification and implementation (Obsolete) (July 1988)