Simple definition

Reverse DNS is a concept or mechanism used in a network & dns to resolve an IP address to a name via DNS Inverse.

Technical definition

In a business environment, Reverse DNS mainly intervenes to solve an IP address to a name via DNS The implementation of the project depends on the architecture, equipment and security policies in place.

What is it used for?

solve an IP address to a name via DNS Inverse.

Practical example

a mail server checks the PTR an IP dispatcher.

Common issues

PTR absent
PTR inconsistent
area managed by operator

Key takeaway: Always adapt the diagnosis to the product version and the architecture actually deployed.