SP Best Corporation Co., LTD.

Any device whose MAC address begins with B4:05:66 has a network interface built by SP Best Corporation Co., LTD.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

B4:05:66

Organization

SP Best Corporation Co., LTD.

Address

555/25 B-Avenue, Sukhaphibal 5 Road Saimai Bangkok TH 10220

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.