Ping is a protocol that sends a message to another computer and waits for a reply, most often used to check if another computer on a network is reachable. This will tell you several things. It will tell you what IP address your domain is resolving to, if it is reachable, and if so, how long it takes to send a message to our server and back to your computer.
1. Click Start
2. Click on run
3. Type in 'cmd'
4. Press Ok
5. This should being up a command prompt. Type in ping domain.com, replacing domain.com with your domain.
Open up a terminal through Applications >> Utilities >> Terminal. Type in ping domain.com, replacing domain.com with your domain name.