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2. List of Internet top-level domains - Wikipedia

   en.wikipedia.org/wiki/List_of_Internet_top-level...

   This list of Internet top-level domains (TLD) contains top-level domains, which are those domains in the DNS root zone of the Domain Name System of the Internet. A list of the top-level domains by the Internet Assigned Numbers Authority (IANA) is maintained at the Root Zone Database. [1]

3. Domain name registry - Wikipedia

   en.wikipedia.org/wiki/Domain_name_registry

   A domain name registry is a database of all domain names and the associated registrant information in the top level domains of the Domain Name System (DNS) of the Internet that enables third party entities to request administrative control of a domain name. Most registries operate on the top-level and second-level of the DNS.

4. List of DNS record types - Wikipedia

   en.wikipedia.org/wiki/List_of_DNS_record_types

   Returns all records of all types known to the name server. If the name server does not have any information on the name, the request will be forwarded on. The records returned may not be complete. For example, if there is both an A and an MX for a name, but the name server has only the A record cached, only the A record will be returned.

5. Domain registration - Wikipedia

   en.wikipedia.org/wiki/Domain_registration

   In 1993 the U.S. Department of Commerce, in conjunction with several public and private entities, created InterNIC to maintain a central database that contains all the registered domain names and the associated IP addresses in the U.S. (other countries maintain their own NICs (Network Information Centers) -- there is a link below that discusses Canada's system, for example).

6. Country code top-level domain - Wikipedia

   en.wikipedia.org/wiki/Country_code_top-level_domain

   Name DNS name of the two-letter country-code top-level domain. They follow ISO 3166-1 alpha-2, with some exceptions such as ".ac" for Ascension Island, ".eu" for the European Union, or ".uk" for United Kingdom of Great Britain and Northern Ireland instead of ".gb". ISO codes bv, bl, mf, sj, gb, and um are not used for country code top-level domains

7. Domain Name System - Wikipedia

   en.wikipedia.org/wiki/Domain_Name_System

   The registry receives registration information from each domain name registrar, which is authorized (accredited) to assign names in the corresponding zone and publishes the information using the WHOIS protocol. As of 2015, usage of RDAP is being considered. [58] ICANN publishes the complete list of TLDs, TLD registries, and domain name registrars.