Free Reverse IP Lookup: Find Sites on an IP

A reverse IP lookup shows which domains are hosted on the same IP address as a website or server. Enter a domain name or an IP address, and this free tool returns a numbered list of the domains it finds. You can copy the list or download it as a CSV file. No sign-in is needed.

What Is a Reverse IP Lookup?

A reverse IP lookup starts with an IP address and works backward to find the domain names connected to it. A normal lookup goes from a domain to its IP. This one goes the other way and lists the neighbors.

Many websites can sit on one server. On shared hosting, dozens or even hundreds of unrelated sites may use a single IP address. A reverse IP search reveals that group, sometimes called the "IP neighborhood."

It is different from a plain reverse DNS lookup. Reverse DNS reads the pointer (PTR) record for an address and usually returns one hostname. Command-line tools such as nslookup or dig -x do this on Linux, macOS and Windows. Those commands will not list every site on the server. This tool combines the reverse DNS hostname with search-based discovery to build a wider list of domains.

Domain input vs. IP input

If you type a domain, the tool first finds the public IP address behind it, then looks for other domains on that address. If you type an IP, it skips that step and goes straight to the lookup. A domain with several IP addresses is checked against the first public address found. For other addresses, use an A record lookup to see them all.

How to Do a Reverse IP Lookup With This Tool

You only need one input, and the whole check takes a few seconds. Follow these steps:

1. Find the field labeled Enter Domain or IP Address.
2. Type a domain such as example.com or an IP address such as 192.168.1.1. The placeholder shows both formats. Use a public address, since private ranges cannot be verified.
3. Submit the form with the main button.
4. Read the summary at the top. It shows how many domains were found, the host you entered and the IP address that was checked.
5. Scroll to Domains Hosted on This IP. Each row has a number, a domain name and a visit link that opens the site in a new tab.
6. Select Copy Results to copy the domain list, or Download CSV to save a file with two columns: No and Domain.

If you see an error asking for a valid public IP address or domain, check for typos, extra spaces or a private address, then try again.

Worked Example: Checking a Domain

Suppose you run a small blog and want to know who shares your server. You type myblog-example.com into the field and submit it. The tool finds that the domain points to the address 203.0.113.25 (an illustrative address). It then reports "4 domain(s) found" and lists them.

The list might show your own domain, a bakery site, a plumbing company and a hobby forum. All four share one IP. Here is how to read that:

• Four small, unrelated sites is normal for shared hosting.
• Your own domain in the list confirms the lookup reached the right server.
• Spammy or adult domains you do not recognize are worth a closer look, because you share an address with them.

Your next step would be to run the shared IP through a blacklist checker. If it is listed, email from your server may be affected, so contact your host.

How Do You Read and Act on the Results?

The results page gives you a count, a list and sometimes a notice. Each one points to a specific action.

When the count is high

A very long list usually means shared hosting, a content delivery network or a reverse proxy. In that case the IP belongs to a provider, not to one site owner. Run an ASN lookup to see which organization controls the address range.

When you see a provider notice

If the search source is unavailable, the page warns that any rows shown are partial reverse DNS observations and that coverage is unverified. Treat that list as incomplete. Wait a little and run the check again.

When the list is empty

The page says no domains were returned and adds that this does not prove no other domains share the IP. Take that literally. An empty list means "nothing found," not "nothing there."

Who Uses Reverse IP Search, and When?

A reverse IP domain checker is useful whenever the question is "what else lives on this server?" Common situations include:

• Site owners on shared hosting who want to know whether their neighbors are clean before email deliverability or reputation problems appear.
• SEO specialists who audit link networks. If many sites linking to a target share one address, that is a footprint worth noting. For checking many addresses at once, a Class C IP checker helps spot clustered ranges.
• Security researchers who map related infrastructure after finding a suspicious or compromised domain.
• Buyers of expired or aftermarket domains who want to see what else sits on the server hosting a site they plan to acquire.
• Web developers and sysadmins who inherit a server and need a quick inventory of the domains pointing to it.

Best Practices and Troubleshooting Tips

You get the most useful results by starting with the right input and cross-checking what you find.

Start from the IP when you can

If you already know the address, enter it directly. This avoids any confusion about which IP a domain resolves to. If you only have a domain, use Domain to IP first to confirm the address, then check it here.

Do not paste a full URL path

Enter just the domain, such as example.com. Long paths, query strings or stray characters can trigger the validation error. A leading www. is fine.

Common problems and fixes

• Error about a public address: You may have entered a private or reserved address, or a domain that does not resolve. Check the spelling and try the public IP.
• Domains you do not recognize: This is expected on shared hosting. Visit a few rows to see what they are before drawing conclusions.
• Results differ between runs: Hosting changes and source availability can vary. Run it again later and compare the CSV files.
• Your site is missing from the list: Coverage is not complete, so a missing domain does not mean it is hosted elsewhere.

Save your findings

Use Download CSV to keep a dated record. Comparing two files over time shows whether neighbors have moved on or new ones have arrived. If you manage a larger set of addresses, bulk IP lookup can add location and network details for each.

What Are the Limits of Reverse IP Results?

Reverse IP results are a best-effort list, not a complete hosting inventory. No public method can list every domain on an address.

• Sites that search sources have not indexed will not appear.
• Domains that recently moved to or from the IP may be missing or outdated.
• Large providers and CDNs put many unrelated sites behind one address, so a long list does not mean those sites are connected.
• Sharing an IP does not prove shared ownership. Treat the list as a lead to investigate, never as proof.
• Only the first public IP found for a domain is checked, so multi-IP setups need extra lookups. IPv6 users can find those addresses with an AAAA record lookup.

Sharing an IP with other sites is not a direct ranking factor in Google Search. The practical risks are an IP with a poor reputation or a slow, overcrowded server.

Check Your Server Neighborhood Now

This reverse IP lookup gives you a quick, readable view of who shares an address, with one-click copy and CSV export. Enter a domain or IP in the field above and run the check. Then test the IP for blacklisting or review its network owner. For more utilities like this, browse the Network and IP tools collection.