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how to find the MAC address of a device, if you know its IP address

If you know the IP address of the device (such as an ethernet card), you can find the MAC address by logging onto a PC that is plugged in on the same network as the device (said ethernet card);
 - open a DOS window (Start -> Run -> cmd)
- at the DOS prompt, type in the following command:    (where is the IP address of the (ethernet) device )
 
    arp -a <ip address>

The output of this command will show the device’s MAC address.

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