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ASN lookup

Find the Autonomous System Number, network owner and registry details for any IP address.

Look up an IP address

IPv4 and IPv6 are supported. Limit: 5 lookups per 30 minutes.

Tip: use the Who Is Hosting tool to find the IP of a website first.

ASN information

The Autonomous System Number and the organisation that routes the address.

Network owner

The company that owns and manages the IP block.

Registry details

Which regional internet registry allocated the range, and where.