IP Reverse Lookup
Look up the PTR record for any IPv4 or IPv6 address to find its associated hostname
IP Address
About IP Reverse Lookup
Perform a reverse DNS (PTR) lookup to find the hostname behind any IP address. Enter an IPv4 or IPv6 address and instantly see its associated domain — essential for mail server checks, log analysis, and verifying network ownership. Fast, free, and served from the edge.
- Supports IPv4 and IPv6
- Instant PTR record resolution
- Great for mail and abuse investigations
Frequently asked questions
What is a PTR record?
A PTR record maps an IP address back to a hostname — the reverse of the usual name-to-IP lookup — and is widely used to validate mail servers.
Why does an IP have no reverse record?
Not every IP has a PTR record configured; the address owner must set it, so many IPs return no hostname.