This is usually useful if you are on shared hosting. You can know if your website is hosted on a crowded server with hundreds of other sites, or if the server is hosting questionable websites. You can also explore the quality sites hosted on your site’s server. You will get the rough view and I don't think the data is 100% accurate. Pretty interesting to check out.

myIPneighbors is a free service that will let you find who and how many websites are hosted on your site’s server.