ASN Lookup
An Autonomous System Number (ASN) identifies a network under a single administrative domain - Such as an ISP, hosting provider, or large corporation. Enter an IP address to look up its ASN and routing organisation.
What Is an ASN?
An Autonomous System (AS) is a collection of IP address ranges managed by one or more network operators with a common routing policy. Every AS is identified by a unique ASN assigned by regional internet registries (RIRs) such as ARIN, RIPE, APNIC, LACNIC, and AFRINIC.
Common Uses
- Identifying the ISP or hosting provider behind an IP
- Network route analysis and BGP troubleshooting
- Security research and threat intelligence
- Detecting whether an IP belongs to a datacenter or residential network