IN ONE SMART TECHNOLOGY(H,K,)LIMITED

Any device whose MAC address begins with 28:1D:21 has a network interface built by IN ONE SMART TECHNOLOGY(H,K,)LIMITED. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

28:1D:21

Organization

IN ONE SMART TECHNOLOGY(H,K,)LIMITED

Address

UNIT I 1/F MAU LAM COMM BLDG 16-18 MAU LAM ST JORDAN KL HK HONGKONG HK 999077

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.