What this means
The IEEE assigned the MA-L block E0D8C4 to Qingdao Intelligent&Precise Electronics 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 E0:D8:C4, it is Qingdao Intelligent&Precise Electronics Co.,Ltd. hardware.