Domain Name System - Wikipedia
https://en.wikipedia.org/wiki/Domain_Name_System
OverviewFunctionHistoryStructure OperationDNS message formatResource recordsProtocol extensionsThe Domain Name System (DNS) is a hierarchical and distributed naming system for computers, services, and other resources in the Internet or other Internet Protocol (IP) networks. It associates various information with domain names (identification strings) assigned to each of the associated entities. Most prominently, it translates readily memorized domain names to the numerical IP addresses needed for locating and identifying computer services and devices with the underlying
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