Domain name system-DNS works like a house address. In internet there are more then million of website already and more then increasing number of Domain Name System are registering.
Domain Name system is a set of IP Address. Like 192.168.50.1 . To make the domain name system unique from other DNS, this IP Address is used.
To make it clear I give you a example:
Then open a command prompt means Click Start – Run – type CMD and Enter.
A new black screen will come like below picture
Now type ping www.google.com and press ENTER.
You will see that a replay will come like Replay from 220.127.116.11 : bytes=32 time=17ms TTL=48
18.104.22.168 is the IP address of www.google.com
Then go back to Mozila Firefox and type 22.214.171.124 and press ENTER. Your Google page will come.
Who provide this DNS IP Address ?
International Assigned Numbers Authority- IANA provides this IP address for Domain Name Systems. The IP addresses distributed by IANA never used twice and it is unique.