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Types of DNS records

The following categories of data (records) are stored in the DNS Domain Name System:

An A record or address record, maps a hostname to a 32-bit IPv4 address.
An AAAA record or IPv6 address record, maps a hostname to a 128-bit IPv6 address.
A CNAME record or canonical name record, is an alias of one name to another. The A record that the alias is pointing to can be either local or remote - on a foreign name server. Useful when running multiple services from a single IP address, where each service has its own entry in DNS.
A MX record or mail exchange record, maps a domain name to a list of mail exchange servers for that domain.
A PTR record or pointer record, maps an IPv4 address to the canonical name for that host. Setting up a PTR record for a hostname in the domain that corresponds to an IP address implements reverse DNS lookup for that address. For example (at the time of writing), has the IP address, but a PTR record maps to its canonical name,
A NS record or name server record, maps a domain name to a list of DNS servers authoritative for that domain. Delegations depend on NS records.
A SOA record or start of authority record, specifies the DNS server providing authoritative information about an Internet domain, the email of the domain administrator, the domain serial number, and several timers relating to refreshing the zone.
A SRV record is a generalized service location record.
A TXT record allows an administrator to insert arbitrary text into a DNS record. For example, this record is used to implement the Sender Policy Framework and DomainKeys specifications.
NAPTR records ("Naming Authority Pointer") are a newer type of DNS record that support regular expression based rewriting.
Other types of records simply provide information (for example, a LOC record gives the physical location of a host), or experimental data (for example, a WKS record gives a list of servers offering some well known service such as HTTP or POP3 for a domain).

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