Reverse DNS (Domain Name System) lookup, also known by the acronym (rDNS), is the process by which someone can look up a host name given a particular IP address. Reverse DNS is also known in some places as reverse resolving. It is the opposite of DNS lookup, by which someone looks up an IP address given a particular host name.
Why use Reverse DNS?
A reverse DNS lookup is usually performed for troubleshooting purposes. Commonly, tools like a traceroute or a ping will do a reverse DNS lookup to determine the flow of traffic from one point to another. Another common place for reverse DNS lookup is when accessing a persons email. Many modern email providers will do reverse DNS lookups to determine if an email was sent from a known spam address. Finally, reverse DNS can be used to make sure that there is a proper relationship between the owner of a server and the owner of a domain name. This technique, known as Forward Confirmed reverse DNS (FCrDNS) is used to put a stop to phishing sites and spammers.
What is IPv4 Reverse DNS lookup?
IPv4 Reverse DNS is a type of reverse DNS that uses a reverse IN-ADDR entry with the special domain in-addr.arpa. The IP...
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