Reverse DNS Formatter
Convert an IPv4 or IPv6 address into its reverse DNS (.arpa) zone name.
- Runs in your browser
- No upload on server
- Free, forever
- Enter details
- Run check
- Copy result
Reverse zone
8.8.8.8.in-addr.arpa
Used to publish PTR records that map an IP back to a hostname.
How this works — and why it's private
- Paste an IPv4 or IPv6 address.
- We reverse the octets/nibbles and append .in-addr.arpa or .ip6.arpa.
- Use the result as the host for a PTR record in your reverse zone.
No DNS query is made — formatting only.
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