Advantech Czech

Any device whose MAC address begins with C4:B1:6B has a network interface built by Advantech Czech. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

C4:B1:6B

Organization

Advantech Czech

Address

Sokolska 71 Usti nad Orlici CZ 56204

Source

IEEE OUI registry

Have a full MAC address? Look it up— we'll also tell you if it's a randomized (private) address rather than a real manufacturer prefix.