Matches
The address has a PTR record, and that host name points back to the same address.
Free reverse DNS lookup for any IP address
Find the host name an IP address points back to, and check that the name points to the same address.
- Free, with no signup
- Runs in your browser
What your result means
Does not match
The PTR host name does not point back to the address.
No PTR record
Gmail and other receivers expect a PTR record on every address that sends email.
Questions about the reverse lookup
What is a PTR record?
The record that maps an IP address back to a host name. The holder of the address block, often your host or provider, sets it.
Why does reverse DNS matter for email?
Receivers check that a sending address has a PTR record and that its host name points back to the same address. Gmail requires both from senders.
I use Google Workspace or Microsoft 365. Do I set PTR records?
No. Google and Microsoft send from their own addresses and set those PTR records themselves.
Found a problem? We will check the rest.
Book a deliverability audit and we will look at every domain and mailbox you send from.