What this means
The IEEE assigned the MA-M block 5019110 to AYDUO ELEKTRONIK SAN. DAN. VE TIC. A.S.. 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 50:19:11:0, it is AYDUO ELEKTRONIK SAN. DAN. VE TIC. A.S. hardware.