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As a general purpose database, the DNS has also been used in combating unsolicited email (spam) by storing blocklist. The DNS database is conventionally stored in a structured text file, the zone file, but other database systems are common. The Domain Name System originally used the User Datagram Protocol (UDP) as transport over IP.
A DNS name server is a server that stores the DNS records, such as address (A, AAAA) records, name server (NS) records, and mail exchanger (MX) records for a domain name (see also List of DNS record types) and responds with answers to queries against its database.
The root zone file is a small (about 2 MB) data set [6] whose publication is the primary purpose of root name servers. This is not to be confused with the root.hints file used to bootstrap a resolver. The root zone file is at the apex of a hierarchical distributed database called the Domain Name System (DNS).
An annotated example of a domain name. In the Internet, a domain name is a string that identifies a realm of administrative autonomy, authority or control. Domain names are often used to identify services provided through the Internet, such as websites, email services and more.
This list of DNS record types is an overview of resource records (RRs) permissible in zone files of the Domain Name System (DNS). It also contains pseudo-RRs. It also contains pseudo-RRs. Resource records
A DNS zone is a specific portion of the DNS namespace in the Domain Name System (DNS), which a specific organization or administrator manages. A DNS zone is an administrative space allowing more granular control of the DNS components, such as authoritative nameserver .
The hostname en.wikipedia.org is composed of the DNS labels en (hostname or leaf domain), wikipedia (second-level domain), and org (top-level domain). Labels such as 2600 and 3abc may be used in hostnames, but -hi- , _hi_, and *hi* are invalid.
The Internet Assigned Numbers Authority (IANA) is a standards organization that oversees global IP address allocation, autonomous system number allocation, root zone management in the Domain Name System (DNS), media types, and other Internet Protocol–related symbols and Internet numbers.