This means that 2 24 (= 16.777.216) unique OUAs can be assigned per OUI.
Bit 25-48 (network adapter identifier): Bits 25 to 48 provide device manufacturers with 24 bits for assigning a unique hardware identifier (organizationally unique address, OUA). A corresponding service is available, for example, on. The assignment of OUIs is usually public and can be determined via databases. Bit 3–24 (manufacturer identification): Bits 3 to 24 encode an identifier (organizationally unique identifier, OUI), which is assigned exclusively to hardware manufacturers by IEEE. Addresses that are only locally unique are called locally administered address (LAA) and are marked with U/L = 1. If U/L = 0, the address is valid worldwide as a universally administered address (UAA). The command displays a list of network adapters or equivalent devices and their MAC. 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). In the Command Prompt window type getmac /v /fo list and then press Enter. 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). 
Bit 1 (receiver): The first bit of the MAC address specifies whether it is an individual or group address. This is your computer's Ethernet MAC address. 
Under Ethernet adapter Wireless Network Connection, a Physical Address displays. The bit sequence of each MAC address is divided into 4 areas, each of which encodes different information. In the command prompt, type ipconfig /all.
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