Reverse DNS Lookup
Free Reverse DNS Lookup Tool
Find the PTR hostname published for any public IP address, or resolve a domain to its IPs and reverse-lookup each one — live, no sign-up.
Reverse DNS Lookup
Find the PTR hostname for an IP address, or every IP a domain resolves to.
Enter a domain above to run a real, live check.
Capabilities
What it checks
IP → hostname
Look up the PTR record an IP's owner has published for it.
Domain → all IPs
Resolves a domain's A/AAAA records, then reverse-looks-up each one.
IPv4 & IPv6
Handles both address families, including full IPv6 nibble expansion.
Why use it
Benefits
- Verify a mail server's PTR record matches its forward DNS — a common SPF/deliverability check.
- Identify the real owner behind an unfamiliar IP in server logs.
- Export results as JSON to attach to a ticket or share with a teammate.
FAQ
Frequently Asked Questions
It looks up the PTR record for an IP address — the hostname the IP's owner has published for it — the inverse of a normal A record lookup.