E-Prime Co., Ltd.

Any device whose MAC address begins with B4:28:F1 has a network interface built by E-Prime 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

B4:28:F1

Organization

E-Prime Co., Ltd.

Address

Rm1207, Kolon Science Valley, 811, Seoul KR 152050

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.