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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