Canonical Textual Representation of Four-octet AS Numbers

Document Type Expired Internet-Draft (individual in rtg area)
Authors Geoff Huston  , George Michaelson 
Last updated 2015-10-14 (latest revision 2007-12-03)
Stream Internet Engineering Task Force (IETF)
Intended RFC status Informational
Expired & archived
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Stream WG state (None)
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IESG IESG state Expired (IESG: Dead)
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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This Internet-Draft is no longer active.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.)