Test Everything is an interesting page that allows you to run about 150 different types of tests on the URLs of your choice. One of the functions offered is a tool that allows you to obtain the specific IP address of any web page and another allows you to visualize the contents of the cache of google. There really is an impressive array of tools available for free at this site and they are organized into the following categories: CSS and HTML validators, SEO tools, Social services, web proxies network tools, text tools, image tools and miscellaneous tools. Basically just enter a URL into the provided box, pick the tool you want to use, and get instant results.