Sapphire Technology Limited.

Any device whose MAC address begins with DC:9C:52 has a network interface built by Sapphire 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

DC:9C:52

Organization

Sapphire Technology Limited.

Address

Unit 1909-1919, 19/F., Tower 2, Grand Central Plaza, HK

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.