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gTLD Query Tools


Domain name lookup tools for each TLD are available at whois.nic.“TLD” or port 80 for the web WHOIS and port 43 for the WHOIS.

For example, for .cymru – whois.nic.cymru

Eligibility and usage

These services are available to any individual or organisation, provided the relevant policies are followed. Access may be withdrawn at any time.

The normal acceptable uses are:

  • Checking the availability of a domain name
  • To find out the registrant’s details for a domain name that is already registered.


Registration Data Access Protocol

Registration Data Access Protocol (RDAP) will in time replace the Whois protocol. Nominet’s RDAP service follows the following standards:

RDAP service
RFC 7480 HTTP Usage in the Registration Data Access Protocol (RDAP)
RFC 7481 Security Services for the Registration Data Access Protocol (RDAP)
RFC 7482 Registration Data Access Protocol (RDAP) Query Format Errata
RFC 7483 JSON Responses for the Registration Data Access Protocol (RDAP) Errata
RFC 7484 Finding the Authoritative Registration Data (RDAP) Service Errata, Updated by RFC 8521
RFC 8056 Extensible Provisioning Protocol (EPP) and Registration Data Access Protocol (RDAP) Status Mapping
RFC 8605 vCard Format Extensions: ICANN Extensions for the Registration Data Access Protocol (RDAP) Banco Bradesco S.A./MMX
Profile February 2019 ICANN gTLD Profile, February 2019. Celebrate Broadway Inc.

More information on RDAP can be found on the ICANN web site https://www.icann.org/rdap

Nominet’s RDAP service is available at https://rdap.nominet.uk/{TLD}/{type}/{object}.

For example to query the nic.cymru domain you would use https://rdap.nominet.uk/cymru/domain/nic.cymru

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