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This question already has an answer here:

Hi everyone I recently bought an Arduino Mega and Arduino Ethernet Shield. There are lots of forum posts that say the shield should have a MAC address that is written on the back side of shield, but I don't have any sticker which has the MAC address. Does anyone know how I can get my MAC address or configure it with a new MAC address? Thanks

marked as duplicate by Greenonline, Nick Gammon, TheDoctor, Anonymous Penguin Aug 14 '15 at 21:08

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  • You can set the MAC address to whatever you want. See the above question that yeti mentions. – Greenonline Aug 11 '15 at 21:24
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According to this documentation, you can just provide your own.

mac: the MAC (Media access control) address for the device (array of 6 bytes). this is the Ethernet hardware address of your shield. Newer Arduino Ethernet Shields include a sticker with the device's MAC address. For older shields, choose your own.

  • YES... you can define a MAC yourself. If you want to do it right, read a bit about MACs, especially the LAA-bit and how not to specify a broadcast address... – yeti Aug 11 '15 at 18:40

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