ASN Lookup
Find Autonomous System Number information
What is an ASN?
An Autonomous System Number (ASN) is a unique identifier assigned to a network or a group of networks managed by a single organization.
ASNs are used in the Border Gateway Protocol (BGP) to identify which networks can exchange routing information with each other.
How to Use
Enter either:
- An ASN (with or without 'AS' prefix), like AS15169 or 15169
- An IP address to find the ASN it belongs to