The Hierachy :

For any domain to be found, the major requirement is DNS. Every domain name, which is a part of the DNS system, it has several DNS settings, also known as DNS records. In order for these DNS records to work, the DNS zone was created. In the simplest of terms, DNS is the mapping of Names to an IP address.

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Root Server

Maps the domain to the DNS server. Done by Domain Registration.


Dns Server

Maps the domain to an IP adress. Managed by the operator of the DNS server. Correct DNS configured Servers are Registered with ARIN to offer reverse delegation. i.e reverse records that are valid. Offers various records compromising of a zone file.


The Domain

Responds to the DNS records provided, on a configured Server and points to webserver / mailserver etc.

A DNS record (resourse records or RRs) are rules in a DNS zone that point a hostname to an IP, another hostname or specific service on a hostname.


What makes up a Dns zone file?

All of the following make up a record.

SOA Record
AAAA Record / A Record
MX Record
CNAME Record
TXT Record


Differences between the A, CNAME

Before going further into the details, it’s important to know that A and CNAME records are standard DNS records.

The general rule is:

use an A record if you manage what IP addresses are assigned to a particular machine or if the IP are fixed (this is the most common case) use a CNAME record if you want to alias a name to another name, and you don’t need other records (such as MX records for emails) for the same name 

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