What this means

The IEEE assigned the MA-L block F0DEF1 to Wistron Infocomm (Zhongshan) Corporation. 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 F0:DE:F1, it is Wistron Infocomm (Zhongshan) Corporation hardware.