Virtual machine Universal Unique Identifier (UUID)
Each virtual machine is automatically assigned a universal unique identifier (UUID). The UUID is generated when you initially power on the virtual machine and ensures that the VM is properly identified. It is stored in the SMBIOS system information descriptor and can be accessed using standard the SMBIOS scanning software, such as SiSoftware Sandra, smbios2, or FirmwareTablesView.
The UUID will remain constant as long as the virtual machine is not moved or copied to another location. If you move or copy the virtual machine to another location, you will be prompted to specify whether you moved or copied the virtual machine the first time you power it on. If you specify that the virtual machine was copied, the virtual machine will receive a new UUID.