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The hierarchical domain name system, organized into zones, each served by domain name servers. Today, the Internet Corporation for Assigned Names and Numbers (ICANN) manages the top-level development and architecture of the Internet domain name space. It authorizes domain name registrars, through which domain names may be registered and reassigned.
The hierarchical Domain Name System for class Internet, organized into zones, each served by a name server Administrative responsibility for any zone may be divided by creating additional zones. Authority over the new zone is said to be delegated to a designated name server.
Therefore, the domain name space is partitioned into areas (zones) for this purpose. A zone starts at a domain and extends downward in the tree to the leaf nodes or to the top-level of subdomains where other zones start. [1] A DNS zone is implemented in the configuration system of a domain name server.
The DNS root zone is the top-level DNS zone in the hierarchical namespace of the Domain Name System (DNS) of the Internet.. Before October 1, 2016, the root zone had been overseen by the Internet Corporation for Assigned Names and Numbers (ICANN) which delegates the management to a subsidiary acting as the Internet Assigned Numbers Authority (IANA). [1]
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.
Originally, the top-level domain space was organized into three main groups: Countries, Categories, and Multiorganizations. [2] An additional temporary group consisted of only the initial DNS domain, .arpa, [3] and was intended for transitional purposes toward the stabilization of the domain name system.
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