Reverse DNS Lookup
Resolve an IPv4 or IPv6 address back to its PTR record. Reverse DNS is used by mail servers to verify senders, so a missing PTR often explains email delivery problems.
About the Reverse DNS Lookup
Resolve an IPv4 or IPv6 address back to its PTR record. Reverse DNS is used by mail servers to verify senders, so a missing PTR often explains email delivery problems.
Queries run from our global edge network, so you see what a neutral observer on the public internet sees — not what your local network or ISP resolver happens to have cached.
Frequently asked questions
What does the Reverse DNS Lookup do?
Resolve an IPv4 or IPv6 address back to its PTR record. Reverse DNS is used by mail servers to verify senders, so a missing PTR often explains email delivery problems.
Is the Reverse DNS Lookup free to use?
Yes. The Reverse DNS Lookup is completely free with no account, no signup and no usage limits for normal use.
Do you log the lookups I run?
No. Queries are processed at the edge and returned straight to you. We do not retain, profile or sell your lookup history.