What this checker tests
- PTR hostname
- Forward A/AAAA confirmation
- Missing PTR records
- Public-address safety
Free domain diagnostic
Reverse DNS Lookup
Find the PTR hostname for a public IPv4 or IPv6 address and check forward confirmation.
How to understand the result
Reverse DNS maps an IP address back to a hostname.
Mail servers commonly use PTR and forward confirmation during reputation checks.
The IP owner or hosting provider normally controls the PTR record.
Common problems
- No PTR
- PTR hostname does not resolve back to the IP
- Unexpected host identity
- Private or reserved input