ADC Corporation

Any device whose MAC address begins with EC:42:B4 has a network interface built by ADC 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

EC:42:B4

Organization

ADC Corporation

Address

77-1, Miyako Namegawa-machi, Hiki-gun Saitama Pref. JP 355-0812

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.