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About the ASN Lookup

Inspect an autonomous system: who operates it, which address prefixes it announces to the internet, and how it connects to the wider routing table.

• Operator name, country and registry
• Announced IPv4 and IPv6 prefixes
• Useful for routing investigations and abuse reports

Frequently asked questions

What is an autonomous system?

A group of IP networks under one operator with a single routing policy. Every ISP and large hosting provider has at least one, identified by an AS number.

How do I find the ASN for a website?

Look up the site's IP address first — the result includes the AS number announcing it.

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