About Reverse DNS
Reverse DNS is a free online tool from freeonlinetools.live. Find the hostname of an IP and check it points back.
Reverse DNS turns an IP address back into a hostname using its PTR record. The tool also checks that the hostname resolves to the same address, which mail servers rely on.
How to use Reverse DNS
- Type or paste an IPv4 or IPv6 address.
- Press Enter or click “Look up”.
- See each PTR hostname and whether it is forward-confirmed.
Features
- Free to use, with no signup and no watermark
- PTR lookup for IPv4 and IPv6
- Forward-confirmed reverse DNS check
- Provider, ASN and country for the address
- Works on desktop and mobile browsers
Frequently asked questions
Is Reverse DNS free?
Yes. Reverse DNS is free and does not need an account.
Do I need to install anything?
No. Everything runs in your web browser, so it works on Windows, macOS, Linux, ChromeOS, Android and iOS.
What does forward-confirmed mean?
The hostname from the PTR record resolves back to the same IP address. Mail servers and some security checks treat an address without this as suspicious.
Why is there no hostname?
Only the owner of an address block can set PTR records, and many home and mobile addresses have none.