Reverse DNS Lookup

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About this tool

Perform Reverse DNS Lookup

This tool takes an IP address and returns the hostname associated with that IP. A forward DNS lookup just does the opposite.

What is reverse DNS lookup?

A reverse DNS lookup is a DNS query for a domain or hostname against a given IP address. It is the opposite of a forward DNS lookup, in which a DNS query can get the IP address against a domain or hostname.

The Internet Engineering Task Force (IETF) standard suggests that every domain on the internet should perform the reverse DNA lookup. But that is not a hard-coded rule. Therefore, reverse DNA lookup is not universally adopted.

How does reverse DNS lookup work?

In reverse DNS lookup, the DNS query is performed to DNS servers for getting the PTR (Pointer) record. If the server does not have the PTR record, then the reverse lookup cannot be performed.

PTR records store the IPv4 addresses with their segments reversed, and they append "" to that. However, in IPv6, PTR records are kept within the "" domain instead of ""

Where are Reverse DNS entries used?

Email servers commonly use reverse DNS entries to check that the email comes from the valid server before bringing it into their network. Many email servers will reject messages from any server that does not support reverse DNS lookups or from a server that has a bad reputation.

Many Internet services, network tools, and logging software also employ reverse dns lookups to provide users with human-readable domains in their log data instead of many numeric IP addresses.

Find a hostname for an IP address by performing a reverse DNS lookup ?

  • For that, open the tool: Hostname to IP Resolver.
  • Enter an IP address. Here is a sample, enter IP address and click on the "Check Now" button.
  • The tool performs the reverse DNS lookup and provides you the domain or hostname associated with the IP address. Here the hostname against IP address is