REVERSE IP
LOOKUP
Enter an IP address, or a domain to resolve first, to find other websites hosted on the same address. On shared hosting many sites share one IP, so this shows your server neighbours, which matters for email reputation, SEO, and knowing whether you are sharing an address with spam or adult sites.
What is a Reverse IP Lookup?
A reverse IP lookup is a free tool that finds the other domains hosted on the same IP address. On shared hosting many sites share one IP, so it reveals your server neighbours, which matters for email reputation and SEO. It relies on passive-DNS data that records domain-to-IP mappings across the internet.
How does a Reverse IP Lookup work?
- 01We resolve the domain to its IP, then query passive-DNS records.
- 02Other domains seen on the same IP are listed back to you.
- 03A short list points to a dedicated IP; a long one means shared hosting.
Frequently asked questions
Why does it matter which sites share my IP?
On shared hosting your site sits on the same IP as dozens or hundreds of others. If a neighbour sends spam or hosts malware, that IP can be blacklisted, and your email and search reputation suffer through no fault of your own. Knowing your neighbours tells you whether a dedicated IP is worth it.
The lookup returned few or no domains. What does that mean?
A short list usually means a dedicated IP, common on VPS and cloud hosting, which is a good sign for reputation. It can also mean the site sits behind a CDN like Cloudflare, where the visible IP is shared by the CDN rather than by co-hosted sites, so the neighbours you see are CDN customers, not server-mates.
How is reverse IP lookup different from a normal DNS lookup?
A normal DNS lookup goes forward: domain to IP. A reverse IP lookup goes the other way and, crucially, finds every domain pointing at one IP, which DNS alone cannot do. It relies on a passive-DNS database that records domain-to-IP mappings observed across the internet over time.