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What is an Autonomous System Number?

April 26, 2017Autonomous system

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What is an Autonomous System Number?

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A public AS has a globally unique number, an Autonomous System number (ASN), associated with it; this number is used in both the exchange of exterior routing information (between neighboring Autonomous Systems), and as an identifier of the AS itself. There are two types of Autonomous System numbers; Public AS numbers and Private AS numbers. On 1 January 2007, APNIC began processing applications for both two-byte and four-byte AS numbers.

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A. An autonomous system number uniquely identifies an autonomous system. These numbers are controled by ARIN, and cannot be randomly selected or configured yourself. You must receive an AS number from ARIN before you can start running BGP.