SST Taiwan Ltd.

Any device whose MAC address begins with 34:81:F4 has a network interface built by SST Taiwan Ltd.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

34:81:F4

Organization

SST Taiwan Ltd.

Address

5F, No. 5, Industry E Rd. VII, Hsin Chu, Taiwan TW 30077

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.