user11728: 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 

user407: 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.


11728: <p>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 </p>
 407: <p>According to <a href="https://www.arduino.cc/en/Reference/EthernetBegin" rel="nofollow">this documentation</a>, you can just provide your own.</p>

<blockquote>
  <p>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.</p>
</blockquote>
