ioBridge, Inc.

Any device whose MAC address begins with D4:28:B2 has a network interface built by ioBridge, 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

D4:28:B2

Organization

ioBridge, Inc.

Address

225 Cedar Hill Street Marlborough MA US 01752

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.