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What is an Autonomous System Number (ASN)

Autonomous System Number (ASN) is a globally unique identifier that defines a group of one or more IP prefixes run by one or more network operators that maintain a single, clearly-defined routing policy. These groups of IP prefixes are known as autonomous systems. The ASN allows the autonomous systems to exchange routing information with other autonomous systems.

Network operators across the world need Autonomous System Numbers to control routing within their networks as well as exchange routing information with other network operators - example; Internet Service providers.

Types of ASNs

There are two types of ASNs, namely private and public ASN.

  • A private ASN can be used for a system which is communicating via BGP with one provider
  • A public ASN is needed to exchange information over the Internet.

Benefits of having a public AS Number

  • Network operators can have their own network identity internally and externally
  • The capability of establishing own Border Gateway Protocol with a public ASN
  • Ability to directly peer with Internet Exchange Points
  • Network operators can have better control of the traffic
  • Flexible Network Management
  • IP Address portability is one of the major benefits of using own IP address and ASN

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Autonomous System

Autonomous System

  • Public Autonomous System Number

  • Private Autonomous system Number

  • Assigning of AS numbers

Autonomous System (AS) is a group of routers and networks working under a single administrative domain. It is a 16-bit value that defines the routing domain of the routers. These numbers range from 1 to 65535.

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