The simplest way to find the IP address for a particular hostname is with the ping command. In Windows, open a command prompt as follows:

1. Click on the Start menu
2. Click Run...
3. Type cmd then click on the OK button.
4. Type ping domainname.com. Replace "domainname.com" with your actual domain name.
5. You should get an output that looks like this:

Pinging dns1.speedingbits.com [12.34.56.78] with 32 bytes of data:

Reply from 12.34.56.78: bytes=32 time=1ms TTL=64 (et cetera).

In this case, the IP address is 12.34.56.78, though yours will be different.

To ping in the Mac OS X Environment:

1. Double-click on the Hard Drive icon > Applications folder > Utilities folder > Network Utility program
2. Select the Ping tab and enter your domain name.
3. Press Enter.