Use "localhost" for your database host name in your applications. Note that there is no option to remotely connect directly to your database on the free hosting servers (connections must come from x10hosting's web servers), so the actual physical address of the database server doesn't matter; the virtual links in the system will resolve the address properly for you if you use "localhost". (It also means you don't need to make any adjustments if you are running an XAMP stack on a machine at home for testing, such as WAMP Server or XAMPP.)