What this means
The IEEE assigned the MA-M block 8002F49 to XUNDI(XIAMEN) ELECTRONIC 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 80:02:F4:9, it is XUNDI(XIAMEN) ELECTRONIC TECHNOLOGY CO.,LTD. hardware.