SankyuElectronics

Any device whose MAC address begins with 78:55:17 has a network interface built by SankyuElectronics. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

78:55:17

Organization

SankyuElectronics

Address

2-30-12 Ohta-ku Tokyo JP 146-0091

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.