UDP Magic Numbers

Document Type Expired Internet-Draft (individual)
Last updated 2016-04-17 (latest revision 2015-10-15)
Stream (None)
Intended RFC status (None)
Expired & archived
pdf htmlized bibtex
Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date
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This Internet-Draft is no longer active.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 specification defines magic numbers in UDP which allow a node to determine or confirm the protocol contained in a UDP payload. This is primarily applicable for encapsulation and transport protocols encapsulated within UDP where intermediate devices, such as middle boxes, need to parse these protocols for providing service. Magic numbers can also be used to multiplex different UDP encapsulated protocols over the same UDP port.


Tom Herbert (tom@herbertland.com)
Lucy Yong (lucy.yong@huawei.com)

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