Web-hosting is one the most crucial elements in Website Administration. A bad web-host can cause serious harm to your websites reputation.
Now you may want to know where your rival websites or high-traffic websites like Engadget etc. are hosting.
There is this website – WhoIsHostingThis/, which can tell you the name of the Hosting Company from the url of the website.
Another website is – Netcraft. They report many different things like – a site’s operating system, web server, and netblock owner together with, if available, a graphical view of the time since last reboot for each of the computers serving the site.