Reverse DNS (PTR)
Determine hostname by IP address via PTR record.
Reverse DNS query (PTR)
Determine a domain name by IP address via PTR record. Reverse DNS is used for mail server authentication, diagnostics and security.
PTR record by IP address
Forward and reverse DNS match check
IPv4 support
How to Use
- Enter an IP address for a reverse DNS lookup
- Click the PTR record lookup button
- Review the domain name associated with this IP address
FAQ
Mail servers check PTR records to filter spam. Missing PTR can cause your emails to be rejected.