Who owns MAC prefix C4B16B?

C4B16B is registered to Advantech Czech in the IEEE MA-L registry.

What devices use C4B16B?

Any network device with a MAC address starting C4:B1:6B was manufactured by or for Advantech Czech.

MA-L · OUI prefix

Advantech Czech

Any MAC address starting C4:B1:6B is registered to Advantech Czech in CZ.

OUI prefix	C4B16B
Vendor	Advantech Czech
Registry	MA-L (24-bit, large block)
Country	CZ
Example MAC	C4:B1:6B:00:00:00

What this means

The IEEE assigned the MA-L block C4B16B to Advantech Czech. 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 C4:B1:6B, it is Advantech Czech hardware.

Look up another MAC