Reverse DNS and PTR Records Explained

Quick answer: Reverse DNS maps an IP address back to a hostname using a PTR record in the reverse DNS namespace.

Why reverse DNS matters

Mail systems, security teams and network operators may use reverse DNS as one signal when evaluating an IP. A PTR record does not prove who owns a server, but it can provide a useful hostname associated with the address.

Forward and reverse DNS are different

Forward DNS normally maps a hostname to an IP. Reverse DNS starts with the IP and asks which PTR hostname is published for it. The two directions can be configured independently.

Start with DNS Lookup to investigate a domain’s records.