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ASN & IP Network Lookup
Find the Autonomous System (ASN), network name, BGP prefix and country behind any IP or domain.
We resolve the IP and query the Team Cymru IP-to-ASN service.
Next step: DNS Lookup →
About the ASN Lookup
An ASN (Autonomous System Number) identifies the network that owns a block of IP addresses — usually an ISP, host or cloud provider. This tool maps an IP to its ASN, network name and BGP prefix.
What this tool checks
- The ASN and the organization behind it
- The BGP prefix (IP range) the address belongs to
- Registry and country of the network
Frequently asked questions
What's an ASN used for?
It's the unit of internet routing. Knowing the ASN tells you who actually hosts a site — AWS, Cloudflare, a specific ISP, etc.
Can one company have several ASNs?
Yes — large providers operate many ASNs across regions.
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