Wednesday, 27 May 2015

About Domain Name


A domain name is an identification string that defines a realm of administrative autonomy, authority or control within the Internet. Domain names are formed by the rules and procedures of the Domain Name System (DNS). Any name registered in the DNS is a domain name.

Domain names are used to identify one or more IP addresses. For example, the domain name www. patelwebs.com represents about a dozen IP addresses.

Domain names are used in URLs to identify particular Web pages. For example, in the URLhttp://www.patelwebs.com/index.php, the domain name is patelwebs.com.
Every domain name has a suffix that indicates which top level domain (TLD) it belongs to.
There are only a limited number of such domains. 

For example:

. In- Indian Website extension.
. gov - Government agencies
.edu - Educational institutions
.org - Organizations (nonprofit)
.mil - Military
.com - commercial business
.net - Network organizations
.ca - Canada
.th - Thailand

Because the Internet is based on IP addresses, not domain names, every Web server requires a Domain Name System (DNS) server to translate domain names into IP addresse

A third level can be defined to identify a particular host server at the Internet address. In our example, "www" is the name of the server that handles Internet requests. (A second server might be called "www2.") A third level of domain name is not required. For example, the fully-qualified domain name could have been "totalbaseball.com" and the server assumed.




Subdomain levels can be used. 

For example, you could have "www.nyyankees.totalbaseball.com." Together, "www.totalbaseball.com" constitutes a fully-qualified domain name.

Second-level domain names must be unique on the Internet and registered with one of the ICANN-accredited registrars for the COM, NET, and ORG top-level domains. Where appropriate, a top-level domain name can be geographic. (Currently, most non-U.S. domain names use a top-level domain name based on the country the server is in.) To register a U. S. geographic domain name or a domain name under a country code, see an appropriate registrar.

On the Web, the domain name is that part of the Uniform Resource Locator(URL) that tells a domain name server using the domain name system (DNS) whether and where to forward a request for a Web page. The domain name is mapped to an IP address (which represents a physical point on the Internet).

More than one domain name can be mapped to the same Internet address. This allows multiple individuals, businesses, and organizations to have separate Internet identities while sharing the same Internet server.

To see the IP address for a domain name, (Ping).

It may be worth noting that the domain name system contains an even higher level of domain than the top-level domain. The highest level is the root domain, which would be represented by a single dot (just as in many hierarchical file systems, a root directory is represented by a "/" ) if it were ever used. If the dot for the root domain were shown in the URL, it would be to the right of the top-level domain name. However, the dot is assumed to be there, but never shown.

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