Tools
Check an IP address’s PTR records
Find the reverse DNS hostname for an IP address and check whether it matches forward DNS (important for email deliverability).
Lookup details
Technical details returned for this address and its reverse DNS lookup.
- IP address
- Address range
- Reverse lookup name
- Reverse DNS zone
Reverse DNS hostnames
These hostnames are published by the organization that controls the IP address.
What PTR records tell you
A PTR record maps an IP address back to a hostname. Mail servers frequently check it when evaluating incoming connections.
- Reverse lookup
- The query starts with an IP address and returns the hostname published for it.
- Forward confirmation
- The PTR hostname should resolve through A or AAAA records to the original IP address.
- TTL
- The TTL indicates how long a resolver may cache the PTR answer before checking again.