Domain Tools

IP to Domain Lookup

Find the domain name connected to an IP address, where it is publicly available.

Enter an IP address (or a domain, to look up its IP first).

Not sure what to enter? Try an example: 1.1.1.1

Free & instant No signup How to use FAQ

Enter an IP address to find the domain or hostname publicly associated with it.

Can you find a domain name from an IP address?

Often, but not always. This tool performs a reverse DNS (PTR) lookup, which returns the hostname the owner of the IP address has published for it. Shared hosting and CDN addresses can serve thousands of websites, and their PTR record usually names the provider's server rather than any one site, so the result may not be the website you expected.

How to look up the domain for an IP address

Enter an IP address, for example 8.8.8.8, in the box above.
Click Look Up.
Read the hostname returned for the address.
If no hostname is found, the address owner has not published a PTR record - that is common and not an error.

Related checks

To go the other way - from a domain to its IP addresses - use IP Address Lookup.
If the hostname belongs to a CDN, identify the provider with CDN Detection.
To see every IPv4 address a domain points to, run an A Record Lookup.

This works by looking up the PTR record configured for that specific IP address - but not every IP address has one set up. Many shared hosting providers, cloud platforms, and ISPs configure reverse DNS to point to their own internal naming scheme rather than a customer's actual domain, so a "no result" or an unrelated-looking hostname doesn't necessarily mean anything is wrong - it just means no domain-specific PTR record exists for that IP. JustChecker tracks your server's IP address and alerts you if it ever changes.

Frequently Asked Questions

Shared hosting and CDNs serve thousands of sites from one address, and DNS has no public list of them. This lookup shows the name the IP itself publishes.

When you see an unknown IP in your server logs, analytics or a firewall alert and want to know whether it belongs to a search engine, a cloud provider or a hosting company.

The hostname often reveals the network or hosting company. The person or business using it is not public.

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