A reverse IP lookup answers a question a normal DNS lookup cannot: given one IP address, which domains are hosted on it? Enter an IP address, or a domain that you want resolved first, and this free tool returns the other sites sharing that address.
This is the reverse of what DNS normally does. Looking up a domain to find its IP is easy. Going the other way is not, and the reason is worth understanding before you read your results.
Why Reverse IP Is Not Just a DNS Query
DNS has no record type that answers “list every domain pointing at this address”. The closest thing is a PTR record, which returns at most one hostname, and it is usually the hosting provider’s own label rather than a customer site. On many shared and CDN addresses there is no PTR record at all.
Listing the domains on an address therefore requires a dataset built by resolving millions of domains in advance and recording where each one pointed. That is what a reverse IP tool queries. It is a snapshot of a crawl, not a live reading of the address, which is why any honest reverse IP result is a strong indication rather than a complete census.
How to Use This Tool
- Enter an IP address or a domain. Either works. If you enter a domain, it is resolved to its A record first and the resolved address is shown with the results, so you always know which IP was actually queried.
- Select Find Domains. The lookup runs against the reverse IP dataset.
- Read the list. You get the count and the domains found on that address. Very busy addresses return a capped sample rather than the full set, and the tool says so when that happens.
What the Results Actually Mean
Two results are commonly misread, so it is worth being precise about both.
A long list does not mean a bad neighborhood. Shared hosting is normal and most small sites live on an address with hundreds of others. A crowded address is only a concern if you are investigating spam or abuse, and even then the neighbors matter more than the number.
An empty result does not prove the address is dedicated. It can equally mean the address is simply not well represented in the dataset. Absence of evidence is not evidence of a dedicated server.
There is one case that trips people up constantly: if the domain you entered sits behind a CDN or proxy such as Cloudflare, it resolves to a shared edge address. The domains you then see are other customers of that CDN edge, not sites sharing a server with yours. The result is accurate, it just does not tell you what you probably wanted to know about your own hosting.
What People Use Reverse IP For
- Checking a shared hosting environment. Seeing how many sites share your address, and what kind of sites they are.
- Investigating an unfamiliar address. Working out what a server is used for when an address turns up in logs or a referral report.
- Footprinting a company. Finding other properties an organization runs on the same infrastructure.
- Email deliverability research. A shared address with spam-heavy neighbors can affect reputation, which pairs well with a blacklist check.
Does Sharing an IP Affect SEO?
On its own, no. Google has said for years that sharing an IP address with other sites is normal and is not itself a ranking factor. The overwhelming majority of websites are on shared hosting, and Google is well aware of that.
What can matter is an extreme case: an address used almost entirely for spam, malware, or link networks, where the pattern rather than the shared address is the problem. For an ordinary site on ordinary shared hosting, the neighbors are not something to worry about. If you want to check the things that genuinely do affect rankings, run the page through our website SEO score checker instead.
Related IP and Domain Tools
To see the geographic location, network, and time zone behind an address, use the IP location lookup. To go the usual direction and find the address behind a domain, use domain to IP. For registration and ownership records, use the WhoIs lookup, and for the full DNS picture see find DNS records.
