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Canonical Textual Representation of Four-octet AS Numbers

Document Type Expired Internet-Draft (individual in rtg area)
Expired & archived
Authors Geoff Huston , George G. Michaelson
Last updated 2015-10-14 (Latest revision 2007-12-03)
RFC stream Internet Engineering Task Force (IETF)
Intended RFC status Informational
Stream WG state (None)
Document shepherd (None)
IESG IESG state Expired (IESG: Dead)
Action Holders
Consensus boilerplate Unknown
Telechat date (None)
Responsible AD Bill Fenner (ˢˣˠ)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


A taxonomy of textual representations for four-octet Autonomous System (AS) numbers is defined. The 'asdot' textual representation is recommended. The syntax chosen avoids ambiguity with Border Gateway Protocol (BGP) community string representation of AS numbers. It is recommended that this textual representation be used by all documents, systems and user interfaces referring to four-octet AS numbers.


Geoff Huston
George G. Michaelson

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