In computer networking, reverse DNS look up or reverse DNS resolution (rDNS) is the determination of a domain name that is associated with a given IP address using the Domain Name System (DNS) of the Internet. To simplify DNS is a table kinda thing which stores the domain name corresponds to the IP address of that particular domain name or server IP address in which the website is hosted.
Whois look up is finding the IP address of the server corresponds to the domain name while reverse DNS lookup is vice verse, that is finding the domain name from the IP address.Doing an IP look Up or WHOIS look up is very simple, there are numerous web service which do this all you have to do is to enter the domain name or IP in the website, in few seconds it gives you all information regarding your query. It provides the information like
- Name of the domain
- Location of the server
- Registrant of the domain
- Address of the registrant
- Registrant’s email id
Here the first 3 information are 100% correct while the others may or may not be correct, because those details are entered by the domain registrant when he buys the domain form the registrar. People who practices hacking or some unethical activities never enter the original detail, and some times the registrar itself provide some duplicate mail id and address in name of privacy to the registrant. When the scenario is like this you can’t find out the original owner of the domain, but through the other details you can find out the server and its location.
Why DNS look up is needed? Please read other articles under the category ‘Ethical Hacking‘. When hacker attack is detected through means like internet, Trojan horse, then you have to find out where the hacker’s server is located or to where the Trojan is sending the details, if it is email hacking you need to find out where the email is generated from.
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