Reverse IP Lookup
Enter an IPv4 address to list the websites hosted on it. Shared hosting, suspicious neighbours and the size of a server's footprint become visible in one lookup.
- Runs on our servers
- Free to use
- API available →
About this tool
Every IP address can host many websites, and knowing which ones share yours, or a suspicious one, answers a lot of questions: is my server blacklisted because of a neighbour, how big is this hosting provider's footprint, which other domains does an attacker run on the same box. The Reverse IP Lookup queries the APIVoid Reverse IP API and lists up to 100 domains resolving to the address, with copy and reputation actions for each.
In cybersecurity, reverse IP lookup helps uncover domains hosted on the same IP address, identify potentially malicious websites, investigate phishing campaigns, detect suspicious infrastructure, and enhance threat intelligence. It provides valuable context for security investigations and attack surface analysis.
Other related actions you can perform with our tools include checking an IP address using the IP Blacklist Check, and finding a website's IP address using Find Website IP.
How to use it — quick steps
- 01
Enter the IP address
Type or paste the IPv4 address of the server; your own address is pre-filled as an example.
- 02
Press "Find websites on this IP"
The address is matched against a database of domains resolving to it, built from DNS data.
- 03
Review the domains
Up to 100 names are listed, each with copy and domain reputation actions, plus a copy-all link.
Key features of this tool
Up to 100 domains
The first page of results is shown, which covers the vast majority of shared servers; the total count tells you when there are more.
One-click reputation
Every domain links straight to the Domain Reputation Check, handy for spotting bad neighbours on a shared host.
Copy what you need
Easily copy a single domain or the whole list that you can use for a spreadsheet or for a domain scanner script.
Frequently asked questions
What is a reverse IP lookup?
The opposite of a DNS lookup: instead of resolving a name to an address, it lists the names known to resolve to a given address. It relies on passive DNS data, so very new or rarely visited sites may be missing.
Why does it matter who shares my IP?
On shared hosting, spam or malware on a neighbour can get the whole IP blacklisted and hurt your e-mail and search ranking. Checking the neighbours explains sudden reputation problems.
Does it work with IPv6 or CDN addresses?
IPv4 only. CDN and large cloud addresses are shared by thousands of sites, so the count is capped and the list is only a sample.
Where does the data come from?
The APIVoid Reverse IP API, which maintains a passive DNS index containing over 100 million domain-to-IP mappings.