Reverse DNS other wise recognized as RDNS is a process of utilizing standard DNS to translate IP addresses into Host Names. RDNS also determines the hostname or host related name with a given IP address or a host address. In simple terms, like how domain name system turns domain name into related IP address, the same way RDNS turns IP address into a domain name.  For instance, if you have an IP address of 192.0.3.26 then it will turn your IP into xyz.example.com. For your computer domains, normal DNS begins with the company, which you listed your domains with. So, anybody can access your domains, and you could send them to any IP addresses you may desire. Reverse DNS on the other hand, works in the same manner. For your IP’s, normal reverse DNS begins with your ISP begin registered. So, anybody can look up the reverse DNS entries for your IP, and you could come back to any Host Names you desire.

So for both typical DNS and reverse DNS, there are two steps:

1. You require DNS servers.

2. You require telling the right company where your DNS servers are placed. Without Step 2, no one is capable to reach your DNS servers.

A standard DNS lookup is utilized to decide which IP address is related with a hostname. A reverse DNS lookup is utilized for the opposite reason, to decide which hostname is related with an IP address. Sometimes reverse DNS lookups are obligatory for analytical purposes. Today, reverse DNS lookups are utilized often for security purposes to mark out any hacker or spammer. Many modern mailing systems use DNS reverse mapping to offer simple verification using dual lookup: hostname-to-address and address-to-hostname.

Also Read Understanding DNS

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