Reverse DNS Lookup
Find the hostname (PTR) associated with an IP address using the fast, free online reverse DNS lookup.
Find the hostname (PTR) associated with an IP address using the fast, free online reverse DNS lookup.
Free reverse DNS (PTR) lookup: find the hostname tied to an IPv4 address — useful for email, logs and network troubleshooting.
With Reverse DNS Lookup you get fast, easy-to-read results that are useful for both professional and everyday use.
A PTR record maps an IP to a hostname. Mail servers often expect PTR aligned with the HELO hostname to reduce rejections.
| Term | Meaning |
|---|---|
| PTR | Record pointing IP → hostname in the reverse zone (in-addr.arpa). |
| Forward vs reverse | A record resolves domain→IP; PTR resolves IP→domain. |
| No PTR | Common on residential or generic cloud IPs — not an error by itself. |
| FCrDNS | Forward-confirmed reverse DNS: PTR matches A/AAAA lookup of the hostname. |
Yes. The XploreNetHub Reverse DNS Lookup is 100% free, with no sign-up or installation required.
No. The tool runs entirely in your browser and works on any device with an internet connection.
Just enter the IP address and run it; the Reverse DNS Lookup finds the hostname (PTR record) associated with an IP address and shows the result instantly.
We do not store the data you submit. Processing happens only to produce the result of your request.
Yes. The interface is responsive and works on phones, tablets and desktops.
Many servers reject mail from IPs without PTR or with generic PTR. Set PTR at your IP provider alongside SPF/DKIM.