Universal Access Technology, Inc.

Any device whose MAC address begins with 00:04:57 has a network interface built by Universal Access Technology, 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

00:04:57

Organization

Universal Access Technology, Inc.

Address

2 Fl., No. 5, Alley 22, Nei Hu Taipei, TW TAIWAN 114

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.