Prefix WhoIs

Prefix WhoIs is an open source project that develops and operates a free whois-compatible framework for stockpiling and querying various routing and registry information.

Prefix WhoIs uses global BGP routing data learned from many ISP backbone routers.

[2] Many public servers around the world operate mirrors of Prefix WhoIs, making the information generally available worldwide.

Several client software packages are available from both Prefix WhoIs itself and from commercial vendors.

These include free, open source utilities such as WhoB and Layer Four Traceroute.

This example Prefix WhoIs query shows various information about an IP address including its network origin and registrar details