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2. Domain Name System - Wikipedia

   en.wikipedia.org/wiki/Domain_Name_System

   The Domain Name System (DNS) is a hierarchical and distributed name service that provides a naming system for computers, services, and other resources on the Internet or other Internet Protocol (IP) networks. It associates various information with domain names (identification strings) assigned to each of the associated entities.

3. Domain name registry - Wikipedia

   en.wikipedia.org/wiki/Domain_name_registry

   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. Wildcard DNS record - Wikipedia

   en.wikipedia.org/wiki/Wildcard_DNS_record

   Wildcard DNS record. A wildcard DNS record is a record in a DNS zone that will match requests for non-existent domain names. A wildcard DNS record is specified by using a * as the leftmost label (part) of a domain name, e.g. *.example.com. The exact rules for when a wildcard will match are specified in RFC 1034, but the rules are neither ...

5. Reverse DNS lookup - Wikipedia

   en.wikipedia.org/wiki/Reverse_DNS_lookup

   In computer networks, a reverse DNS lookup or reverse DNS resolution (rDNS) is the querying technique of the Domain Name System (DNS) to determine the domain name associated with an IP address – the reverse of the usual "forward" DNS lookup of an IP address from a domain name. [1] The process of reverse resolving of an IP address uses PTR ...

6. Google Public DNS - Wikipedia

   en.wikipedia.org/wiki/Google_Public_DNS

   Google Public DNS is a Domain Name System (DNS) service offered to Internet users worldwide by Google. It functions as a recursive name server. Google Public DNS was announced on December 3, 2009, [1] in an effort described as "making the web faster and more secure." [2][3] As of 2018, it is the largest public DNS service in the world, handling ...

7. 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