All tools
DNS & Infrastructure
Reverse DNS / PTR
Look up the PTR record for any IPv4 or IPv6 address and verify forward-confirmed reverse DNS (FCrDNS).
This tool is being wired up. The analyzer ships in the next build phase.
About this check
PTR lookups with forward-confirmed reverse DNS check.
Frequently asked questions
- What does the Reverse DNS / PTR actually check?
- PTR lookups with forward-confirmed reverse DNS check.
- Is this really free?
- Yes. Every on.bo tool is free, no signup required, no rate-limit tricks.
- Do you store the data I check?
- We log minimal metadata to keep the service healthy. Lookups themselves are not retained beyond short-term caching.