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The MAC address is usually either on the side of the case, or on the bottom. It will be a random string of letters and numbers with dashes or a colon between them. There are 12 total characters and the letters will never go past the letter F. (A-F and 0-9)

For example, you're looking for something with a pattern of:

xx-xx-xx-xx-xx-xx or xx:xx:xx:xx:xx:xx

A Real World example will look like:

9E-54-95-2D-50-62 or 91:BF:7A:16:CA:17

In some rare cases, vendors will print the MAC address without any separator like so:
0F 35 95 E9 B5 DA

Hope that helps!