DFI Inc

Any device whose MAC address begins with A4:1C:B4 has a network interface built by DFI 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

A4:1C:B4

Organization

DFI Inc

Address

No.157, Shanying Rd., Gueishan Dist., Taoyuan City 333424, Taiwan (R.O.C.) Taoyuan City TW 333424

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.