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Alternative NTP port

Document Type Replaced Internet-Draft (candidate for ntp WG)
Author Miroslav Lichvar
Last updated 2020-09-16
Replaced by draft-ietf-ntp-alternative-port
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
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Stream WG state Call For Adoption By WG Issued
Document shepherd (None)
IESG IESG state Replaced by draft-ietf-ntp-alternative-port
Consensus boilerplate Unknown
Telechat date (None)
Responsible AD (None)
Send notices to (None)
This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at:


This document updates RFC 5905 to specify an alternative port for the Network Time Protocol (NTP) which is restricted to NTP messages that do not allow traffic amplification in order to make NTP safe for the Internet.


Miroslav Lichvar

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