If U/L = 0, the address is valid worldwide as a universally administered address (UAA). Bit 2 (registry): The second bit of the MAC address indicates whether it is an address with global validity (universal) or whether the address has been assigned locally (local).Multicast addresses are identified by I/G = 1 and are addressed to several receivers.
If I/G = 0, it is a unicast address for a single network adapter. This bit is called I/G (short for individual/group).
The bit sequence of each MAC address is divided into 4 areas, each of which encodes different information.
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