MICRO S.E.R.I.

Any device whose MAC address begins with 40:D5:59 has a network interface built by MICRO S.E.R.I.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

40:D5:59

Organization

MICRO S.E.R.I.

Address

24, rue Henri FARMAN TREMBLAY EN FRANCE Ile de France FR 93290

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.