ACTIVIO Inc.

Any device whose MAC address begins with A4:5E:5A has a network interface built by ACTIVIO 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

A4:5E:5A

Organization

ACTIVIO Inc.

Address

Takeuchi Lorie Bldg. Room 503, 1-34-12, Takadanobaba Shinjuku-ku Tokyo JP 1690075

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.