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WHOIS Sunset: RDAP Takes Over gTLD Registration Data

2025-03-17

Starting January 28, 2025, the Registration Data Access Protocol (RDAP) becomes the primary source for generic top-level domain (gTLD) registration information, replacing the sunsetting WHOIS service. RDAP offers improvements such as internationalization support, secure access, authoritative service discovery, and differentiated data access. Developed by the IETF, RDAP has been used by ICANN-accredited registrars since 2019. Users can access data via ICANN's RDAP lookup service (https://lookup.icann.org/en) or its open-source command-line client. For non-public data, use the Registration Data Request Service (RDRS) or contact the registrar directly.

RDAP: The WHOIS Protocol's Successor Takes Center Stage

2025-02-13

The WHOIS protocol (port 43), a standard for accessing domain name registration data for over 35 years, is being phased out due to its limitations, including lack of standardization, internationalization support, and security. RDAP, developed by the IETF, is its replacement. Designed to address WHOIS's shortcomings, ICANN mandated its support by all gTLD registries and registrars by August 26, 2019. Technical implementation is largely complete, and the next step involves amending registry and registrar agreements to ensure RDAP's service level. ICANN will continue transitioning to RDAP and raising global awareness.

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