Acutis Reverse DNS (PTR) lookup
Enter an IP address and see the hostname it maps back to. Reverse DNS answers the opposite of a normal lookup — it turns an IP into a name (the PTR record). Works for IPv4 and IPv6.
What a PTR record tells you
- A hostname comes back — the IP's owner has published reverse DNS. Mail servers often require this;
8.8.8.8resolves todns.google, for example. - No PTR record — perfectly normal for most home and many cloud IPs. Reverse DNS is optional and set by whoever controls the IP block, not by you.
- The name doesn't match forward DNS — that's common; PTR is just a label and isn't verified against the A/AAAA record unless a service checks both directions (FCrDNS).
FAQ
What is a reverse DNS (PTR) lookup?
It takes an IP address and returns the hostname it maps back to via its PTR record — the opposite of a normal name-to-IP lookup. This tool works for both IPv4 and IPv6.
Why does an IP have no PTR record?
Reverse DNS is optional and set by whoever controls the IP block. Most home connections and many cloud IPs simply have no PTR published, which is normal.
Why doesn't the PTR hostname match the website's domain?
A PTR is just a label and isn't verified against the forward (A/AAAA) record unless a service checks both directions (FCrDNS), so a mismatch is common and not necessarily a problem.
Is this free and private?
Yes. It's free with no sign-up and runs in your browser, querying public Cloudflare and Google DNS-over-HTTPS resolvers; nothing you enter is stored.
An IP resolves — but is your network actually healthy?
Reverse DNS only tells you what a name says. Acutis Go runs the full check — network, DNS and your own machine — in 60 seconds and tells you plainly where the problem is. Free.
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Related guide: What is reverse DNS (PTR)?