NTP

RFC 8039, December 2016 Multipath Time Synchronization

RFC 7822, March 2016 Network Time Protocol Version 4 (NTPv4) Extension Fields

RFC 7821, March 2016 UDP Checksum Complement in the Network Time Protocol (NTP)

RFC 7384, October 2014 Security Requirements of Time Protocols in Packet Switched Networks

RFC 5906, June 2010 Network Time Protocol Version 4: Autokey Specification

RFC 5905, June 2010 Network Time Protocol Version 4: Protocol and Algorithms Specification

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

RFC 1129, October 1989, PDF Internet Time Synchronization: the Network Time Protocol

RFC 1119, Postscript only Network Time Protocol (Version 2) Specification and Implementation

RFC 1059, July 1988 Network Time Protocol (Version 1) Specification and Implementation

RFC 958, September 1985 Network Time Protocol (NTP)

Kernel

RFC 2783, March 2000 Pulse-Per-Second API for UNIX-like Operating Systems, Version 1.0

RFC 1589, March 1994 A Kernel Model for Precision Timekeeping

SNTP

RFC 4330, January 2006 Simple Network Time Protocol (SNTP) Version 4 for IPv4, IPv6 and OSI

RFC 2030, October 1996 Simple Network Time Protocol (SNTP) Version 4 for IPv4, IPv6 and OSI

RFC 1769, March 1995 Simple Network Time Protocol (SNTP)

RFC 1361, August 1992 Simple Network Time Protocol (SNTP)

Ancillary Protocols

RFC 5908, June 2010 Network Time Protocol (NTP) Server Option for DHCPv6

RFC 5907, June 2010 Definitions of Managed Objects for Network Time Protocol Version 4 (NTPv4)

Ancient History

RFC 868, May 1983 Time Protocol

RFC 867, May 1983 Daytime Protocol

RFC 778, April 1981 DCNET Internet Clock Service

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