DNS Records

DNS Records

Record Type	Description	Function
A	Address record	Returns a 32-bit IPv4 address, most commonly used to map hostnames to an IP address of the host.
AAAA	IPv6 address record	Returns a 128-bit IPv6 address, most commonly used to map hostnames to an IP address of the host.
CNAME	Canonical name record	Alias of one name to another: Canonical records (CNAMEs) are useful for pointing one host name at another.
MX	Mail exchange record	Maps a domain name to a list of mail transfer agents for that domain. MX records are those that are looked up by mail servers when email needs to be delivered.
NS	Name server record	A NS record tells recursive name servers which name servers are authoritative for a zone.  Recursive name servers look at the NS records to work out who to ask next when resolving a name.
PTR	Pointer record	While the A record points a domain name to an IP address, the PTR record resolves the IP address to a domain/hostname. PTR records are used for the reverse DNS (Domain Name System) lookup.
SOA	Start of authority record	Specifies authoritative information about a DNS zone, including the primary name server, the email of the domain administrator, the domain serial number, and several timers relating to refreshing the zone.
SRV	Service record	SRV record is a specification of data in the Domain Name System defining the location, i.e. the hostname and port number, of servers for specified services. The SRV records relate to a particular service of the domain, like FTP or SIP, rather than a specific machine the way A or C-name records do.