3B SYSTEM INC.

Any device whose MAC address begins with 00:0F:05 has a network interface built by 3B SYSTEM 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

00:0F:05

Organization

3B SYSTEM INC.

Address

1727, SANKYUK2-DONG, BUK-GU DAEGU KR 702-845

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.