Free Reverse IP Lookup: Find Domains on the Same IP

What Is a Reverse IP Lookup?

Quick answer: A reverse IP lookup takes an IP address, or a domain it resolves first, and lists the websites on the same IP. Enter a value and look up an IP address to see who else is there.

It answers "who else is on my server", which DNS alone cannot. Name-based virtual hosting lets one server answer for hundreds of sites on a shared IP, picking each by the HTTP Host header. The names come from a passive DNS dataset: what was observed, not everything that exists.

How to Run a Reverse IP Lookup

1. Type the target. In the Enter an IP address or domain box, use an IPv4 or IPv6 address, a bare domain, or a pasted URL such as https://www.example.com/path. We strip scheme, path and port. Private addresses such as 10.0.0.1 are refused before any lookup.
2. Press Find Domains. A domain uses its A record first, and AAAA only when no IPv4 address exists.
3. Read the Result card first. It says which IP your name resolved to, so these are the domains sharing that address. Not the address you expected? Stop there.

Tip: Run your domain, then an address you know sits on a large shared host. Counts of 17 and 115 show how crowded each is.

What the Result Shows, With a Real Example

The Result card shows the name you typed, the IP followed by the number of domains found in parentheses, a flag, the country and the owning organization. A typed domain also gets Name servers and Mail servers, read live from DNS. On 2026-10-28, our own site resolved to 131.153.165.47 (Secured Servers LLC).

Counts change as the dataset updates. Hostnames are grouped by registrable domain, so admin.example.com and cpanel.example.com count once as example.com; that is how 57 hostnames became 17 domains.

Why the List Is a Sample, Not a Full Inventory

A PTR record, the reverse DNS entry defined in RFC 1035, maps an address to a hostname its owner chose, usually one, and many shared addresses have none. It cannot list the sites hosted there, so a list of hosted domains needs a passive DNS dataset, which is incomplete by nature.

It returns at most 500 hostnames per address. At that result limit the page warns that the list is a capped sample, as it did for 8.8.8.8: 500 hostnames, 115 domains.

Guests get the first 10 domains and signed in users the first 50, sorted alphabetically. The page prints the true total, such as "Showing the first 10 of 115 domains found on this address", and a Create a free account to see more button. Each listed name opens in a new tab with nofollow.

Answers are cached for 7 days, an empty one for 1 hour, so a brand new site can lag behind. It is not a complete list. The data provider caps free lookups per day for the whole site, and the page can show a separate limit or service message instead of an empty table.

Empty is not proof: No domains found means only that none appeared in the data. The address may be a dedicated IP, or never seen.

Why a Domain Behind a CDN Lists Strangers

Enter a domain and we look up the IP it points to today. Sites behind a content delivery network share an edge address with many unrelated sites. In our test, cloudflare.com resolved to 104.16.132.229 (Canada, Cloudflare, Inc.): 291 hostnames, 56 domains.

If the owner organization is a CDN, treat the list as noise. See the published DNS records with Find DNS Record, then compare hosting provider details in the Domain Hosting Checker. This tool does not look behind a proxy.

Reverse IP Lookup vs Reverse DNS vs IP Location

An address can have a PTR hostname and many hosted domains, or neither, so the answers often disagree. Address ranges and their owners are allocated through the IANA IP address registries.

When a Reverse IP Lookup Is Useful

• See which sites share an IP with yours. A long list suggests a crowded shared server; a short one is only a hint.
• Do hosting research and judge how crowded an IP is.
• Check a suspicious domain's neighbors (IP to domain), then run the address through the Blacklist Checker.
• Look at the neighbors of a phishing domain as one clue for an abuse report, then find who to contact with the WHOIS lookup guide.

Treat the list as context: domains on one IP need not share an owner.

Related Free Domain Tools

More checks for the same job.

• Domain to IP: the quick way to confirm which address a name points to before you run this lookup.
• IP Location: see where it sits.
• WHOIS Lookup: registration details for any neighbor that looks suspicious.
• Ping Tool: test whether a server answers.