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. |
