ARNOS INSTRUMENTS & COMPUTER

Any device whose MAC address begins with 00:40:E7 has a network interface built by ARNOS INSTRUMENTS & COMPUTER. 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:E7

Organization

ARNOS INSTRUMENTS & COMPUTER

Address

SYSTEMS (GROUP) CO., LTD. TSUEN WAN N.T. HK

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.