rDNS is Reverse DNS.

rDNS operates in the exact opposite direction of DNS, it converts IP addresses into domains.

What do we need rDNS for?

One great use of rDNS is for e-mail servers. Example:

  • Your e-mail server mail.yourdomain.com contacts mydomain.com’s mail server.
  • mydomain.com resolves mail.yourdomain.com into 172.22.0.1, in order to send information back to the server.
  • However, mydomain.com has security measures. It wants to make sure 172.22.0.1 really is mail.yourdomain.com, so it performs an rDNS lookup.
  • 172.22.0.1 turns out to resolve to mail.yourdomain.com, so it sends its data.

 

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