The RDAP is a service to look up domain name registration data for a given zone. It includes essential information for contacting the owner of a name in case of technical or other problems and transmits the data in an automated and structured manner. The RDAP is the successor to WHOIS. Its technical protocol is defined in a series of technical reference documents published by the Internet Engineering Task Force (IETF), including RFC7480, RFC7481, RFC9082, RFC9083 and RFC9224.

WHOIS is a service to look up domain name registration data for a given zone. It includes essential information for contacting the owner of a name in case of technical or other problems.