ROSE ELECTRONICS

Any device whose MAC address begins with 00:40:A4 has a network interface built by ROSE ELECTRONICS. 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:A4

Organization

ROSE ELECTRONICS

Address

P.O. BOX 742571 HOUSTON TX US 77274-2571

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.