DNS Insight
ASN Lookup
ASN Lookup - Find Autonomous System Number
Look up the Autonomous System Number (ASN) for an IP address to identify network ownership.
How It Works
This tool queries Team Cymru's DNS-based ASN lookup service to find the AS number, network prefix, country, and registry information for an IP address.
Understanding Results
Results show the ASN, organization name, IP prefix (CIDR block), country code, regional internet registry (RIR), and allocation date. ASN information helps identify network ownership.