Meta-Networks, LLC

Any device whose MAC address begins with B4:81:BF has a network interface built by Meta-Networks, LLC. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

B4:81:BF

Organization

Meta-Networks, LLC

Address

Office 106C, 5/2, Varshavskaya street Saint-Petersburg Saint-Petersburg RU 196128

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.