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The Domain Name System (DNS) is a hierarchical decentralized naming system for computers, services, or other resources connected to the Internet or a private network.It associates various information with domain names assigned to each of the participating entities.For zones operated by a registry, administrative information is often complemented by the registry's RDAP and WHOIS services.
In 1984, four UC Berkeley students, Douglas Terry, Mark Painter, David Riggle, and Songnian Zhou, wrote the first Unix name server implementation for the Berkeley Internet Name Domain, commonly referred to as BIND.
The Domain Name System delegates the responsibility of assigning domain names and mapping those names to Internet resources by designating authoritative name servers for each domain.
Network administrators may delegate authority over sub-domains of their allocated name space to other name servers.
TXT that mapped host names to the numerical addresses of computers on the ARPANET.
Maintenance of numerical addresses, called the Assigned Numbers List, was handled by Jon Postel at the University of Southern California's Information Sciences Institute (ISI), whose team worked closely with SRI. To request a hostname and an address and add a computer to the master file, users contacted the SRI's Network Information Center (NIC), directed by Elizabeth Feinler, by telephone during business hours.
This mechanism provides distributed and fault tolerant service and was designed to avoid a single large central database.