Umezawa Musen Denki Co., Ltd.

Any device whose MAC address begins with 00:04:14 has a network interface built by Umezawa Musen Denki Co., Ltd.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:04:14

Organization

Umezawa Musen Denki Co., Ltd.

Address

14-3, Minami 1, Nishi 8, Hokkaido JAPAN JP 060-0061

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.