What this means
The IEEE assigned the MA-L block 14C3C2 to K.A. Schmersal GmbH & Co. KG. 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 14:C3:C2, it is K.A. Schmersal GmbH & Co. KG hardware.