Yuduan Mobile Co., Ltd.

Any device whose MAC address begins with 28:D9:97 has a network interface built by Yuduan Mobile 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

28:D9:97

Organization

Yuduan Mobile Co., Ltd.

Address

Room 401 No 84 Lane 887 Zuchongzhi Rd. Shanghai CN 201203

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.