What Is A Domain Name and What Is Domain Name System (DNS)?
Symbolic representations or recognizable names are the basic capabilities of a Domain Name of the website instead of their actual numerical address as commanded by the internet. This also helps the website to be moved to another location in the address topology, i.e., the ability of their website’s name to remain unchanged even after being moved to another location on the internet that necessitates the change in the IP address of the website because of the change in location. This movement or translation to another location (to another IP address) on the internet is done successfully with the help of Domain Name System (DNS).
Domain Name System (DNS)
The Domain Name System (DNS) is a organized tree-like hierarchical naming system of web services or websites, computers, or any resource that takes active part on the internet.
The DNS also translates the meaningful domain names that are easily understood by the humans to the binary identifiers (numeric assigners) that are “understood” or associated with networking equipment for the purpose of locating and addressing these devices world-wide.
The internet users can easily remember the name of the website because of the unique alphabetical system of naming the website instead of just using its numeric address as required by and recognized easily only by the computer systems. These only numeric addresses (for example, 188.8.131.52) of the website are very hard to remember by the humans, hence the requirement of unique alphabetic system (for example, MYWebsitename.com, etc.) of naming the website for the common people to remember the site’s name easily.
The great flexibility of the DNS allows a single domain name to be assigned multiple IP addresses. The meaning of this is that one web server having one IP address can have multiple websites (that each website must have unique assigned numeric addresses) hosted on it. In short, this also means that one web server can have multiple websites. There is also the flexibility of having one IP address assigned to multiple web server as in the anycast networking.
Domain names are frequently interchangeably referred to simply as domains, and the registrants of the domain name are referred to as domain owners, or website owners. The domain name is only registered with the domain registrar and it no way confers the ownership of the domain name to the registrant. The registrant of the domain name only gets the exclusive right to use the domain name.
To understand the difference between the Uniform Resource Locator (URL) and the Domain Name, let us see the following example:
Domain name: www.example1.com
Registered domain name: example1.com
The IP address of any web server and its domain name can be used interchangeably.
The top-level domain (TLD) is the end part of every domain name. The top-level domains a re also known as the first-level domains and are from the generic names (three or more characters).
The generic top-level domains are also called the gTLD) and some of the examples of the Top-Level Domains extensions are:
Generic extensions of TLD: .biz, .com, .net, .org, .info
Sponsored extensions of TLD are: .asia, .edu, .gov, .jobs, .mil, .int, .tel, .travel, and .mobi
Reserved extensions of TLD are: .example, .invalid, .localhost, .test
Second-level And Lower Level Domains
The second-level and lower level domains are hierarchical in nature and are called the second-level domain (SLD) names. For example, the en.wiki.org is the second-level domain name. These second-level domain names are placed directly left to the extension like .edu, .com, .net, .info, etc.
The lower-level domain names are placed immediately to the left of the second-level domain. There can be many levels of the domain names without any limitations. An example of a domain with four domain levels is www.sos.state.oh.us. The www preceding the domains is a host name of the World-Wide Web server. Each level is separated by a dot, or period symbol. ‘sos’ is said to be a sub-domain of ‘state.oh.us’, and ‘state’ a sub-domain of ‘oh.us’, etc. The sub-domains are the subordinate levels of their parent domain. The TLD is created by the official domain registration companies, and the subsequent levels of the domain names are created by the domain name owner or the website owner.
The ftp, mail, or the http (www) are the components of the domain name that designates a particular type of web server. Thus, the FTP (for example, ftp.msoft.com) is the FTP server, the mail (eg., mail.yahoo.com) is the mail server, and the HTTP (for example, www.msoft.com) is the World Wide Web (www) server.
To summarize: The domain names are the basic component on which the website is built, and the extension “.com” is the highly sough-after extension of the domain name. These structures are very important in the search engine optimization process of the websites.
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