An Autonomous System Number (ASN) is a unique identifier assigned to a group of IP prefixes that use the same routing policy. It’s essential for BGP routing.

How can I do an ASN number lookup?

Just enter the ASN, IP address, or domain into the tool to retrieve full ASN number search results, including routing and ownership data.

Can I search by IP address?

Yes, our ASN IP lookup feature allows you to enter any public IP and find its corresponding autonomous system.

Is the tool free to use?

Absolutely. Our ASN lookup tool is completely free—no registration or payment required.

Can I lookup BGP information too?

Yes. This tool supports full BGP AS number lookup, including peers, prefixes, and registries.

What registries are supported?

We pull from global RIRs including ARIN, RIPE, APNIC, LACNIC, and AFRINIC.

What is the difference between ASN and IP lookup?

ASN lookup gives info about the network owner and routing. IP lookup identifies which ASN the IP belongs to.

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ASN Lookup Tool – Find Autonomous System Numbers Instantly

Quickly search for any ASN number, BGP AS, or IP-based routing info. Our tool offers fast and accurate autonomous system number lookup with detailed results.

ASN Lookup Tool – Find Autonomous System Numbers Instantly

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