In Mac OS X v10.8 or Mac OS X v10.7, open Utilities folder in Applications folder and double-click Network Utility.

In Mac OS X v10.10 or Mac OS X v10.9, select Computer from Go menu of Finder, double-click Macintosh HD > System > Library > CoreServices > Applications > Network Utility. If Request timed out appears, communication is not taking place. If communication is taking place, a message like the one shown below appears. '' is the IP address of the target device.

Perform a ping test to check if communication is taking place. When you are using wired LAN, make sure Ethernet is selected. When you are using wireless LAN on your computer, make sure Wi-Fi is selected as network interface. Make sure network interface used by computer is selected, and then click Advanced. Select System Preferences from Apple menu, and then click Network. If your computer is not connected to a network, the IP address does not appear.

The IP address and MAC address of your computer appear. In Windows 7 or Windows Vista, click Start > All Programs > Accessories > Command Prompt. If Command Prompt is not displayed on the Start screen, select the Search charm and search for ' Command Prompt'. In Windows 8.1 or Windows 8, select Command Prompt from the Start screen. To check the IP Address or MAC address of your computer, follow the instructions below.

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