Frontier Silicon Ltd

Any device whose MAC address begins with 30:58:90 has a network interface built by Frontier Silicon 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

30:58:90

Organization

Frontier Silicon Ltd

Address

137 Euston Road London GB NW12AA

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.