BQ

Any device whose MAC address begins with B4:9D:0B has a network interface built by BQ. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

B4:9D:0B

Organization

BQ

Address

Sofia, 10 Las Rozas de Madrid Madrid ES 28230

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.