The Network Time Protocol Version 4 Algorithm Specification

Document Type Expired Internet-Draft (ntp WG)
Author William Kasch 
Last updated 2017-05-25 (latest revision 2005-11-15)
Stream Internet Engineering Task Force (IETF)
Expired & archived
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Stream WG state Dead WG Document
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IESG IESG state Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


The Network Time Protocol (NTP) is widely used to synchronize computer clocks in the Internet. This memorandum describes the algorithms used by Version 4 of the NTP (NTPv4) to calculate time values.


William Kasch (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)