Canonical Textual Representation of Four-octet AS Numbers

Document Type Expired Internet-Draft (individual in rtg area)
Last updated 2015-10-14 (latest revision 2007-12-03)
Stream IETF
Intended RFC status Informational
Expired & archived
pdf htmlized (tools) htmlized bibtex
Stream WG state (None)
Document shepherd No shepherd assigned
IESG IESG state Expired (IESG: Dead)
Consensus Boilerplate Unknown
Telechat date
Responsible AD Bill Fenner
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


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 Michaelson (

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