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What is a Domain Name and Why Would I Want One? by anna dawson
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What is a Domain Name and Why Would I Want One? |
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Internet
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What is a Domain Name? Before we can go into what a domain name is I'm going to tell you why we need them as the answers compliment each other. The Internet is just a really big collection of connected computers (a network). For the purpose of explaining domain names you can think of the Internet a bit like the phone system and just like the phone system every computer on the Internet has it's own phone number except an Internet phone number is called an IP addresses. This address is made up of up to 12 digits in the form 123.123.123.123, computers use these IP addresses to send information to each other over the Internet. When the Internet was first created it quickly became clear that these IP addresses were not easy to remember and another method was need to make these addresses more human friendly. The solution to this was the Domain Name System (DNS). Basically the DNS is a really really big phone book for computers. When you type a web site address into your web browser it checks the DNS for that website name and finds the IP address. Once it has the IP address it can then send a message to that computer and ask it for the web page you wanted. OK so you know a domain name is part of a web site address but which part? Lets look at a website address so we can identify and discuss what bit of it is a domain name. http://domain.fadsan.com/en/ The above address is the home page of the itXcel web site. It can be split into 3 main parts. The first part is http:// this just tells your web browser what kind of information it is going to get and how to get it. The last part is /index.html this is name of the files on the remote computer that you want your browser to get. The bit in the middle www.fadsan.com/ is a domain name. This is the name that your computer sends to the DNS to get back the IP address. So you know what a domain name is and that there is a phone book called the DNS to change your easy to remember domain name into an IP address that you computer can understand. The Internet phone book (DNS) is special in that everyone on the Internet needs to be able to use it. This makes the DNS very very big (100+ million addresses big). Due to the size of this phone book it needed to have a carefully organised and managed structure. Domain names themselves are split into different levels like a hierarchy. The DNS system uses this hierarchy to search the DNS for the IP address of the domain name it is trying to find. The last bit of a domain, in the previous example the com part is called the top level domain. There are a large selection of top level domains like com, net, org and info. There are also very similar endings called country level domains like india and de. Each of the top level and country level domains are managed by a different organization, sometimes these are companies or non profit organizations and sometimes governments. In the domain business these organisations are referred to as the registries. Each registry looks after it's own part of the domain name registration. If you decide you want to use a domain name in the top level domain com, like fadsan.com you would have to have this name assigned by the registry that manages that top level domain. The process of being assigned a domain name is called domain registration.
Related Articles -
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