Ventilation Control

Any device whose MAC address begins with 80:4B:20 has a network interface built by Ventilation Control. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

80:4B:20

Organization

Ventilation Control

Address

Kronenstrasse 34 Villingen-Schwenningen Baden-Wuerttemberg DE 78054

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.