Use 128 bit UNIQUE ID to create MAC address

I was hoping to use the 128 bit UNIQUE ID to create a unique MAC address on a closed network of 50 boards using TM4C1294. Is there a pattern to the UNIQUE ID registers? Like maybe one of the registers has a value particular to the chip family and maybe some of the registers are incrementing like serial numbers. If I knew which register contains the lower incrementing values then I could use this to create the "unique" MAC address within the 50 board network.

Any other techniques to convert the 128 bit UNIQUE ID to a unique 48 bit address would also be appreciated.