ASN Lookup

An Autonomous System Number (ASN) identifies a network operator on the internet — an ISP, cloud provider, university, or company that manages its own routing policy. Every network large enough to run its own BGP routing has one.

Enter it with or without the "AS" prefix — both "AS15169" and "15169" work the same way.

Ranges like 64512–65534 and 4200000000–4294967294 are reserved for private/internal use (similar to private IP ranges) and aren't assigned to real public networks, so a registry lookup wouldn't return anything meaningful.