ADDTRON TECHNOLOGY CO., LTD.

Any device whose MAC address begins with 00:40:33 has a network interface built by ADDTRON TECHNOLOGY 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

00:40:33

Organization

ADDTRON TECHNOLOGY CO., LTD.

Address

46560 FREMONT BLVD. #303 FREMONT CA US 94538

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.