DNS Lookup: A Domain Name Server(DNS) lookup is the conversion of a domain name into its respective IP address. A reverse DNS lookup is the conversion of an IP address into its respective domain name.
I described in older post named IP address that every machine on Internet has an IP address as like as every registered website has IP address too. When we use to type URL (Unique Resource Locater) like www.google.co.in in our browser's address bar then our request passes through DNS lookup server and it finds requested site's IP address. So, our request reaches to website and it's page display in our browser.
The URL is easy to remember, easy to type, its just for humans for remember. At other side, IP address is hard to remember, hard to type so it is for machine. Mostly we type www.google.co.in for open Google(India) website. But, you can type its IP address 72.14.235.104 and access same. It is Dotted Decimal Number. As like as you can use to type IP address in hexed number 0x48.0x0e.0xeb.0x68, or dword number1208937320, or octal number 0110.0016.0353.0150 and access same Google.
Please refer above picture. You type any described value in your browser's address bar and you just get only www.samair.ru.
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