You can find an IP address from a Media Access Control (MAC) address using the ARP command in a CMD window. It's easier than it sounds.
ARP maps the physical MAC address with the IP. The MAC address is a unique, alphanumeric string programmed on a network card that identifies the computer. The IP address is the number assigned to the network card. Using ARP, the user can find an IP address from the MAC or vice versa.
Click the Start button and select Run. In the textbox, type "cmd" and press Enter. This opens a DOS prompt in a CMD window.
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Type "arp -a" in the command prompt and press Enter. This lists a number of MAC addresses with the associated IP addresses.
Since you have the MAC address, scroll down the list to find the associated IP address. The MAC address is shown in the "Physical Address" column with the IP address in the "Internet Address" column.