What this means
The IEEE assigned the MA-M block D05F642 to SHANGHAI ZHONGMI COMMUNICATION TECHNOLOGY CO.,LTD. Every network interface they manufacture under this block has a MAC address beginning with these digits, followed by a unique per-device identifier. If a device on your network shows a MAC starting D0:5F:64:2, it is SHANGHAI ZHONGMI COMMUNICATION TECHNOLOGY CO.,LTD hardware.