The generated MAC addresses are created by using three parts: the VMware OUI, the SMBIOS UUID for the physical ESXi machine, and a hash based on the name of the entity that the MAC address is being generated for. The VMware Universally Unique Identifier (UUID) generates MAC addresses that are checked for conflicts.
The algorithm guarantees unique MAC addresses within a virtual machine and attempts to provide unique MAC addresses across virtual machines. The MAC address-generation algorithm produces the rest of the MAC address. VMware Organizationally Unique Identifier (OUI) allocation uses the default OUI 00:50:56 as the first three bytes of the MAC address generated for each virtual network. An OUI is a unique MAC address prefix assigned that is assigned to all NIC vendors, both physical and virtual.
Virtual MAC address assignments are based on Microsoft’s organizationally unique identifier (OUI) registration with the Institute for Electrical and Electronic Engineers (IEEE).
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