Reverse DNS Lookup — PTR Record for Any IP
Find the hostname behind any IP address with a free reverse DNS (PTR record) lookup. Works for IPv4 and IPv6, straight from your browser.
What reverse DNS tells you
A PTR record maps an IP address back to a hostname — the mirror image of a normal DNS lookup. Residential IPs typically return machine-generated names revealing the ISP and rough region; servers and mail hosts return their configured hostnames. Mail servers in particular are expected to have a PTR that matches their sending name — without one, their email lands in spam.
The lookup works by querying a special reversed name: 8.8.4.4 becomes 4.4.8.8.in-addr.arpa, and IPv6 addresses reverse each hex digit under ip6.arpa — this tool builds that name for you. Learn more in our reverse DNS guide, or check who owns the IP with WHOIS.
Frequently asked questions
Why does my IP have no PTR record?
PTR records are optional and only the network operator (usually the ISP) can create them. Most consumer IPs have generic ones; some have none — both are normal.