What this means

The IEEE assigned the MA-L block 805EC0 to YEALINK(XIAMEN) NETWORK 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 80:5E:C0, it is YEALINK(XIAMEN) NETWORK TECHNOLOGY CO.,LTD. hardware.