I-O DATA, INC.

Any device whose MAC address begins with 34:76:C5 has a network interface built by I-O DATA, 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

34:76:C5

Organization

I-O DATA, INC.

Address

3-10, SAKURADA-MACHI KANAZAWA ISHIKAWA JP 920-8512

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.