This version of the API is deprecated. It is strongly recommended to use Reverse Whois API 2.0
Reverse Whois API is used to search for domain records based on particular search terms such as name, email, phone, address, etc. that are usually part of Whois records. Query results will consist of all the corresponding domain records.
Here you'll find examples of querying the API implemented in multiple languages.
You'll need a WhoisXmlApi account to authenticate.
Please, refer to the Reverse Whois API User Guide for info on input parameters, request/response formats, authentication instructions and more.