ASN Lookup - Find the Autonomous System for Any IP
ASN Lookup
Find the Network Owner Behind Any IP Address
Ready to Lookup
Enter an IP address above to find its owning network.
Understanding ASNs
Network Attribution
Identify which company or hosting provider actually operates a given IP address.
Abuse Investigation
Find the right network operator to report abuse to when investigating suspicious traffic.
Routing Diagnostics
Understand which autonomous system announces a particular block of IP addresses on the internet.
Local Database Lookup
Uses a locally maintained IP-to-ASN database for fast, reliable results without an external API call per request.
What Is an Autonomous System?
An Autonomous System (AS) is a large network or group of networks under a single administrative organization that presents a common routing policy to the internet. Each AS is assigned a unique Autonomous System Number (ASN), which is how routers exchange reachability information via BGP, the protocol that holds the global internet together.
Key Takeaways
- Public IPs Only: ASN data only applies to public-facing IP addresses, not private network ranges.
- Organization Name Included: Results include both the numeric ASN and the human-readable organization name.
- Fast Local Lookup: Uses a locally maintained database, so results return instantly.