Digital Control Technology Limited

Any device whose MAC address begins with AC:91:5D has a network interface built by Digital Control Technology Limited. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

AC:91:5D

Organization

Digital Control Technology Limited

Address

Unit 1805-06, 18/F, Hollywood Plaza, 610 Nathan Road, Mongkok, Kowloon, Hong Kong Hong Kong HK 00000

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.