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. You can use either the X-Authentication-Token header or the apiKey parameter of the request's body.
Please, refer to the Reverse Whois API User Guide for info on input parameters, request/response formats, authentication instructions and more.