Empacket Corporation

Any device whose MAC address begins with 00:1C:90 has a network interface built by Empacket Corporation. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:1C:90

Organization

Empacket Corporation

Address

2-6-3 Nishi-Gotanda Shinagawa Tokyo JP 141-0031

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.