SPEEDTECH CORP.

Any device whose MAC address begins with 7C:BF:77 has a network interface built by SPEEDTECH CORP.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

7C:BF:77

Organization

SPEEDTECH CORP.

Address

No. 568, Sec. 1, Minsheng N. Rd., Guishan Dist., Taoyuan City 338, Taiwan Taoyuan TW 338

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.