For this example, we are going to take a MAC address linked to the Cisco vendor : A4-B4-39. One way to represent a hexadecimal MAC address is to form six pairs of the characters separated with a hyphen (-) or colon (:). So how did you figure this out? As far as I know (from reading the datasheet I haven't actually gotten around to playing with my ethernet shield yet), the MAC address for the ethernet shield(s) are something that you have to provide from the arduino sketch, not something that is present on the board (as it would be on a PC NIC card.) All you really need to make sure of is that you don't use the same ethernet address as some other system on your local ethernet, and you don't accidentally use a multicast address (odd first byte.) It probably makes sense to use a "locally-administered" MAC address like "02 02 02 02 02 nn" (where nn is a number you pick. Convert Hexadecimal MAC Address to Decimal. ![]() The number in binary representation: Size : 0 B, 0 Characters. I hooked it up to an ethernet cable of a laptop I don't use anymore, and figured out the IP and MAC adress. Enter the hex number (base 16) to decode.
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