Just in case you haven't find out how to do ping test on command prompt, type this:
The domain is a web page of your choice e.g. www.tomshardware.com
However, I wouldn't recommend you use tom's hardware for testing ping (unless it is one of your most frequently visited website). You want to ping to your game server for gaming performance, ping your closest ISP server for minimum internet ping, ping router for minimum ping, and ping your list of most frequent visit website and average them for realistic internet ping.