RING ACCESS, INC.

Any device whose MAC address begins with 00:40:40 has a network interface built by RING ACCESS, INC.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:40:40

Organization

RING ACCESS, INC.

Address

957-R INDUSTRIAL ROAD SAN CARLOS CA US 94070

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.