Reverse DNS Check

Verify the reverse DNS configuration of an IP address


Reverse DNS Check

You can use this reverse DNS tool to find and validate the matching PTR record(s) of any IP address.

What is Reverse DNS?

In a nutshell, reverse DNS translates an IP address (ie, 1.1.1.1) into a hostname (ie, one.one.one.one). This is done through the use of PTR type DNS records, and is essentially the opposite of regular 'forward' DNS queries which translate a given domain name into a computer-friendly IP address.

An IP address is said to be forward-confirmed if the A record it's PTR record resolves to matches the original IP address.

RFC 1912 (Section 2.1) recommends that all internet-reachable hosts should have a "name". In practice, there are plenty of servers on the internet with no/misconfigured reverse DNS settings. One would most likely worry about reverse DNS configuration when setting up and managing a mail server, as they are often referenced when checking whether email is spammy, or coming from a reliable source.