# ASN (Autonomous System Number) Explained

**URL:** <https://community.ipinfo.io/t/asn-autonomous-system-number-explained/5545>\
**Category:** Knowledgebase\
**Tags:** terminology, docs\
**Created:** [March 8, 2024, 2:29pm UTC](https://community.ipinfo.io/t/asn-autonomous-system-number-explained/5545 "2024-03-08T14:29:34Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Abdullah](https://yyz1.discourse-cdn.com/flex035/user_avatar/community.ipinfo.io/abdullah/32/4973_2.png) [@Abdullah](https://community.ipinfo.io/u/Abdullah)\
**Post date:** [March 8, 2024, 2:29pm UTC](https://community.ipinfo.io/t/asn-autonomous-system-number-explained/5545/1 "2024-03-08T14:29:34Z")

</div>

An ASN (Autonomous System Number) is a unique number assigned to an Autonomous System (AS) organization that operates a collection of IP networks and routers. ASNs serve as identifiers for organizations or entities that own or operate networks and have been allocated IP address ranges by a regional Internet authority, such as a [Regional Internet Registry (RIR)](https://community.ipinfo.io/t/regional-internet-registries-rir-explained/5544).

 ![IP range distribution to ASNs by RIRs](https://canada1.discourse-cdn.com/flex035/uploads/ipinfo/original/2X/7/7d030617fee21882027e3d7769002f1cf5c0c1c3.png)

In IPinfo’s case, instead of assigning a unique number, we generally prefix ASNs with “AS” for easier identification and data operations.

Example: [AS2119 Telenor Norge AS details - IPinfo.io](https://ipinfo.io/AS2119)

 ![image](https://canada1.discourse-cdn.com/flex035/uploads/ipinfo/original/2X/2/23eed3dd56c3ca95fad57e4fde744cef04d64cd4.png)