This List of DNS record types

     The Records or Information held by Primary zone, Secondary zone and Stub zone are of various types. Some of the commonly-used record types are :

Alias (CNAME) :

    Refers to domain name aliases, that is , creating an alternate record or DNS name for the name already specified as another type in a particular zone. It is normally found with computers on the Internet perform multiple tasks, such as Web server and Chat server. Under such a situation, the CNAME records may be used to specify multiple names to a single computer.

Host (A or AAAA records) :

    Resolves an IP address to a device. The host records are essential only for the computers sharing resources on network. A records are used for IPv4 and AAAA records are used for IPv6.

Mail Exchange (MX) :

    Identifies mail server and routes the email messages to the specific domain. for .Example,while sending an email to abc@@sonaby.com, your mail server first looks the MX record for sonaby.com to locate the mail server that handles the mail messages for abc@sonaby.com .The mail server further looks the host (A) records to connect to specific IP address.

Pointer (PTR) :

     Used to add the reverse lookup capabilities within a specific domain namespace. For example, a lookup for the domain name for IP address 192.168.0.210 is done through the query of the PTR record in the 0.168.192 form.

Service location (SRV):

    Specifies the location of a TCP/IP service.The SRV records are also used to specify  a specific port for a particular service. For example, a Web server service may be running on a specific port 9090 instead of 80.