Domain Name

A domain name is the way to identify and locate computer connection to the Internet. A domain must be unique i.e. in two organizations on the Internet can have the same domain name.

A domain name contains two or more components separated by period “dots”. Each computer on the Internet is identified by unique IP address. A domain name is a name that identifies one or more IP address.

For example:

The top level domains are classified into three categories:

Organizational/generic domain

The organizational/generic domain consists of three characters code which indicates the primary function of the organizations or their generic behaviour.

The most country used to-level domain are:

  • .com – commercial organizations
  • .edu – Educational institutions
  • .gov – Government agencies
  • .org – Organizations
  • .net – Network organizations
  • .int – International institutions

Country domain

The country domain consists of two characters which represents different countries/regions all round the world.

These code have been standardized by ISO.

Country domain are:

    • . in – India
    • . us – United States
    • . cn – China
    • . au – Australia
    • . it – Italy
    • . jp – Japan
    • . fr – france

Reverse domain

The reverse domain is a special domain named in-addr.apra that is used to translate the IP address to Fully Qualified Domain Name.

Each domain name has a corresponding IP address.

Because the Internet is on IP addresses, not domain name, every web server requires a domain Name System (DNS) server to translate domain name into IP addresses.

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