IP to Hostname
Resolve reverse DNS for an IP address.
Resolving an IP to a hostname reads the PTR record published for that address. It is the reverse of a normal lookup, and it only works when the address's network operator has published a record — many have not.
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Public internet targets onlyResults
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How IP to Hostname works
What it does
Resolve reverse DNS for an IP address.
What you get
The address’s reverse DNS hostname, when published.
Live data sources
The target is sent to a network provider. Results include their source; timeouts and unavailable data are clearly marked.
What if a check cannot finish?
Confirm your input and try again. A timeout, blocked request, or unavailable provider is not proof that a domain is broken. Internet measurements and third-party services have limits.
IP to Hostname — frequently asked questions
No hostname was returned. What does that mean?
No PTR record is published for the address. This is common and is not a fault; only the operator holding the address block can add one.
Is the returned hostname trustworthy?
Only after forward confirmation: resolve the hostname back and check it returns the original IP. A PTR alone is set by the address owner and can claim anything.
Why do mail servers care about PTR records?
Many receivers reject or penalise mail from addresses with no PTR, or whose PTR does not forward-confirm. It is a basic sign of a properly run mail server.