ARIN’s WhoWas report contains historical registration information for a given IP address or Autonomous System Number (ASN). The publication of WhoWas data is provided subject to an approved request under ARIN’s WhoWas Terms of Use (ToU). File Format Because the WhoWas report contains the entire public history for a given IP address or ASN, it is much larger and more complex than a Whois query response. Each IP address or ASN could have been a part of multiple networks/AS ranges over time ...
