Reverse DNS (rDNS) Query

What is Reverse DNS?

Reverse DNS (rDNS) is the reverse of normal DNS. While normal DNS converts domain names to IP addresses, reverse DNS converts IP addresses to host names.

How Does Reverse DNS Work?

Reverse DNS works using PTR (Pointer) records. The IP address is queried in reverse format and the host name is learned.

Reverse DNS Use Cases

Reverse DNS is used for email servers, security research, and network management. It is especially important in spam control.