+--------+--------+---------+--------+--------+---------+
        |  Organizationally Unique  |     Network Interface     |
        |     Identifier (OUI)      | Controller (NIC) Specific |
        +--------+--------+---------+--------+--------+---------+
       /          \
      /            \
     /              \          b0 (I/G bit):
    /                \             0: unicast
   /                  \            1: multicast
  /                    \
 /                      \      b1 (U/L bit):
+--+--+--+--+--+--+--+--+          0: globally unique (OUI enforced)
|b7|b6|b5|b4|b3|b2|b1|b0|          1: locally administered
+--+--+--+--+--+--+--+--+