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'''Autonomous System Numbers (ASN)''' are globally unique numbers and significant part of the Internet routing architecture known as the [[Autonomous System]]. Autonomous System Numbers are taken from a 16-bit number field. There are reserved ASNs, including 0 and 65,535, which can be used to identify non-routed networks. ASNs starting from 64,512 up to 65,534 are reserved for private use while the ASN 23,456 is dedicated to be used in the ASN pool transition.<ref>
[http://www.cisco.com/web/about/ac123/ac147/archived_issues/ipj_9-1/autonomous_system_numbers.html Exploring Autonomous System Numbers]</ref> This means that the available quantity of ASNs for Internet routing is limited.
As per RFC4893 (updated by RFC6793) the ASN space has been extended from 16-bit (two octets) to 32-bit, which greatly expands the available pool<ref>[http://www.iana.org/assignments/as-numbers/as-numbers.xhtml Autonomous System (AS) Numbers]</ref> of ASNs.
ICANN (by means of the [[IANA]]-function) is responsible for distribution to [[RIR]]s
==References==
{{reflist}}
[[Category:Glossary]]