Sumitomo Electric Industries, Ltd

Any device whose MAC address begins with A4:DE:26 has a network interface built by Sumitomo Electric Industries, 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

A4:DE:26

Organization

Sumitomo Electric Industries, Ltd

Address

1-1-3, Shimaya, Konohana-ku Osaka JP 554-0024

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.