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Registry Operators

Registry operators are the organizations that maintain the master database of all domain names registered under a particular generic top-level domain (gTLD).

Information for RDAP Users

The Registration Data Access Protocol (RDAP) enables users to access domain name registration data. It was created as the replacement for the WHOIS protocol. RDAP was developed by the technical community in the Internet Engineering Task Force (IETF).

All gTLD registries and registrars are required to provide RDAP services using the gTLD RDAP Profile, but as of 28 January 2025 they are no longer required to provide WHOIS services (except for .com, .name, and .post).

As of December 2024, it is estimated that the total number of RDAP queries across all types of RDAP servers is over 10 billion queries per month. There are now over 40 known RDAP client implementations and over 15 known RDAP server implementations. ICANN org offers two client implementations.

ICANN RDAP Lookup Tool

ICANN org maintains a publicly available RDAP client that runs inside a user's web browser. This client is free to use, and runs RDAP queries directly from a user's web browser. The ICANN RDAP Lookup Tool can be found here.

ICANN RDAP Command Line Client

ICANN org also maintains a command line-interface (CLI) RDAP client. This client runs on the command line of a computer's terminal application and can be used for scripting RDAP commands. This is an open source client and available on GitHub here.

Other RDAP Clients

A list of client implementations can be found in the Guide to the Registration Data Access Protocol. Please note that neither this guide nor the listed RDAP implementations are endorsed by ICANN, nor does ICANN offer any guarantee of compliance with applicable requirements.

For further information, contact Global Support.