ASN inspector

The ASN inspector let you browse through these AS and its neighbours.

ASN

Autonomous System numbers (ASNs) are globally unique identifiers for Autonomous Systems. An Autonomous System (AS) is a group of IP networks having a single clearly defined routing policy, run by one or more network operators.

An AS needs to be created if a network connects to more than one AS with different routing policies. Some common examples of Autonomous Systems are networks connected to two or more upstream service providers or exchange points, networks peering locally at exchange points.

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.

More information regarding AS numbers is detailed in RFC1930.

(definition by APNIC)