ASN Lookup
Find the autonomous system, network owner and country of an IP address.
About the ASN Lookup tool
Find the autonomous system, network owner and country of an IP address.
Tip: from any lookup box on the site you can type asn:example.com to run this tool directly.
Results are generated live. Each finding is graded as an error, warning or pass and explained so that you know what to fix and why it matters.
Monitor this automatically
Get alerted when this check starts failing, when you land on a blacklist or when a certificate or domain is about to expire.
Start free monitoring