Fujitsu I-Network Systems Limited.

Any device whose MAC address begins with 00:0D:57 has a network interface built by Fujitsu I-Network Systems 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

00:0D:57

Organization

Fujitsu I-Network Systems Limited.

Address

1-403 kosugi-cho nakahara-ku kawasaki kanagawa JP 211-0063

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.