Reverse DNS Lookup
Server requestLook up the PTR record for an IPv4 or IPv6 address. We generate the correct reverse-lookup name and query it over DNS-over-HTTPS.
How to read the results
The reverse name is the DNS name derived from the IP. PTR records are the hostnames the IP points to. A missing PTR is shown as "No records" rather than an error.
Examples
8.8.8.8→dns.google1.1.1.1→one.one.one.one
Data source: Public DNS-over-HTTPS resolver. Reverse names are generated locally; the PTR query goes to a public resolver. Learn about our data sources →
Frequently asked questions
What is a PTR record?
A PTR (pointer) record maps an IP address back to a hostname — the reverse of an A/AAAA record. Mail servers often check it.
Why is there no PTR record?
Many IPs, especially residential and cloud addresses, have no PTR record configured. That is normal and not an error.
How does IPv6 reverse DNS work?
The address is expanded to 32 hex nibbles, reversed, and joined with dots followed by
ip6.arpa. We build this name for you automatically.