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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.For zones operated by a registry, administrative information is often complemented by the registry's RDAP and WHOIS services.That data can be used to gain insight on, and track responsibility for, a given host on the Internet.A DNS name server is a server that stores the DNS records for a domain; a DNS name server responds with answers to queries against its database.
An important and ubiquitous function of DNS is its central role in distributed Internet services such as cloud services and content delivery networks.
This mechanism provides distributed and fault tolerant service and was designed to avoid a single large central database.
The Domain Name System also specifies the technical functionality of the database service that is at its core.
The domain name space consists of a tree data structure.
Each node or leaf in the tree has a label and zero or more resource records (RR), which hold information associated with the domain name.
Although not intended to be a general purpose database, DNS can store records for other types of data for either automatic lookups, such as DNSSEC records, or for human queries such as responsible person (RP) records.