aexcea's reverse domain and hosted domain lookup tool finds an IP address and checks to see how many domains are sharing that IP. A list of clickable domain addresses is provided as a part of the search result and is downloadable as a CSV (Excel compatible) file.

Hosting providers selling "shared hosting" will often stack as many domains onto a single IP as possible. Depending on the provider, anywhere from 100's to 1000's of domains can be sharing the same IP address.

Sharing an IP address with multiple domains can result in poor site performance, poor server performance, network bandwidth bottlenecks, and security risks. Additionally, adult, gambling, pharmaceutical, spammer and other such sites sharing your IP address (your IP neighbors) can have a negative impact on your website's success.