Grandstream Networks, Inc.

Any device whose MAC address begins with C0:74:AD has a network interface built by Grandstream Networks, 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

C0:74:AD

Organization

Grandstream Networks, Inc.

Address

1297 Beacon Street Brookline MA US 02446

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.