Lemobile Information Technology (Beijing) Co., Ltd.

Any device whose MAC address begins with B4:EF:FA has a network interface built by Lemobile Information Technology (Beijing) 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:EF:FA

Organization

Lemobile Information Technology (Beijing) Co., Ltd.

Address

5/F LeEco Building, 105 Yaojiayuan Road, Chaoyang District Beijing Beijing CN 100025

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.