Domain Name Servers

Name Servers

A set of servers called domain name servers (DNS) maps the human-readable names to the IP addresses. These servers are simple databases that map names to IP addresses, and they are distributed all over the Internet. Most individual companies, ISPs and universities maintain small name servers to map host names to IP addresses. There are also central name servers that use data supplied by VeriSign to map domain names to IP addresses.

If you type the URL

http://www.imrozbaig.com

into your browser, your browser extracts the name “www.imrozbaig.com,” passes it to a domain name server, and the domain name server returns the correct IP address for www.imrozbaig.com. A number of name servers may be involved to get the right IP address. For example, in the case of www.howstuffworks.com, the name server for the “com” top-level domain will know the IP address for the name server that knows host names, and a separate query to that name server, operated by the ImrozBaig.com ISP, may deliver the actual IP address for the ImrozBaig.com server machine.

On a UNIX machine, you can access the same service using the nslookup command. Simply type a name like “www.imrozbaig.com” into the command line, and the command will query the name servers and deliver the corresponding IP address to you.

So here it is: The Internet is made up of millions of machines, each with a unique IP address. Many of these machines are server machines, meaning that they provide services to other machines on the Internet. You have heard of many of these servers: e-mail servers, Web servers, FTP servers, Gopher servers and Telnet servers, to name a few. All of these are provided by server machines.

 

 

 

 

 

Imroz

About the author

Imroz Baig wrote 95 articles for Techstarz.

He is one of the founder members of Techstarz. He holds an engineering degree in computer science and an mba in systems. Imroz is based in mumbai and works for a privately owned software development firm. He blogs at techstarz and his personal blog at imrozbaig.com

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