Email · Website glossary

Reverse DNS

Quick answer · What is Reverse DNS?

A lookup that maps an IP address to a name using the reverse DNS namespace, commonly through PTR records.

IN PRACTICE

Reverse DNS: an example

A receiving mail service checks the hostname associated with a sending server's address.

KEEP IN MIND

A reverse result does not prove domain ownership; forward DNS and authentication provide different evidence.

Put the idea to work

Frequently asked questions

What is a practical example of Reverse DNS?

A receiving mail service checks the hostname associated with a sending server's address.

Does a reverse DNS result prove domain ownership?

A reverse result does not prove domain ownership; forward DNS and authentication provide different evidence.

Which concepts should I read alongside Reverse DNS?

PTR record: A DNS record that points a name to another name, commonly used in reverse DNS lookup.
Email deliverability: The practical ability of legitimate mail to reach its intended destination, including acceptance and placement decisions by receiving systems.