Security Design, Inc.

Any device whose MAC address begins with 38:E0:54 has a network interface built by Security Design, 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

38:E0:54

Organization

Security Design, Inc.

Address

Nishiki-cho Trad Square 4F, 3-20 Kanda Nishiki-cho Chiyoda-ku Tokyo JP 101-0054

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.