VTech Telecommunications Ltd.

Any device whose MAC address begins with A4:97:5C has a network interface built by VTech Telecommunications 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

A4:97:5C

Organization

VTech Telecommunications Ltd.

Address

23/F,Tai Ping Industrial Centre ,Block 1 Hong Kong CN 000000

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.