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The ICANN registration data lookup tool gives you the ability to look up the current registration data for domain names and Internet number resources. The tool uses the Registration Data Access Protocol (RDAP) which was created as a replacement of the WHOIS (port 43) protocol.
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ICANN org developed the registration data lookup tool as a free public service. It is based on RDAP, a protocol developed by the technical community in the Internet Engineering Task Force (IETF). This next-generation protocol delivers registration data like WHOIS does, but with improved standardized query and response formats.
On 20 May 2019, the ICANN Board adopted an Interim Registration Data Policy for gTLDs, requiring contracted parties to continue to implement measures consistent with the Temporary Specification during Stage 1, pending implementation of the Board-approved recommendations of the Expedited Policy Development Process (EPDP) on gTLD Registration Data …
To do that, registrars and registries provide public access to data on registered domain names. Anyone can use the WHOIS protocol to search their databases and identify the domain name registrant. In 2016, new ICANN Bylaws replaced the WHOIS obligations originally established by the expired Affirmation of Commitments.