Reverse IP Lookup
Resolve an IPv4 address back to its hostname via its PTR record. Live, free, in your browser.
How it works
Enter an IPv4 address. The tool reverses it into an in-addr.arpa name and queries the PTR record over DNS-over-HTTPS to return the associated hostname.
Using it for research
Reverse lookups help map where a domain is hosted. Combine with a DNS lookup and WHOIS lookup when vetting an expired domain.
Frequently asked questions
What is a reverse IP lookup?
A reverse IP lookup resolves an IP address back to a hostname using its PTR (pointer) record — the opposite of a normal DNS lookup.
How does this tool work?
It builds the in-addr.arpa query for the IP and asks Cloudflare’s DNS-over-HTTPS resolver for the PTR record, live in your browser.
Why might there be no result?
Many IPs have no PTR record configured. A missing PTR is normal and does not mean the address is unused.