Related RFCs
RFC 1930 Guidelines for creation, selection, and registration of an Autonomous System (AS). J. Hawkinson, T. Bates. March 1996.
AS Number Registration Services
Autonomous System Numbers (ASNs) are globally unique numbers that are used to identify autonomous systems and which enable an AS to exchange exterior routing information between neighboring ASes. An AS is a connected group of IP networks that adhere to a single and clearly defined routing policy.
The policies governing AS number allocation and maintenance can be found in the Number Resource Policy Manual.