Inphi Corporation

Any device whose MAC address begins with 00:21:B8 has a network interface built by Inphi 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

00:21:B8

Organization

Inphi Corporation

Address

112 S. Lakeview Canyon Rd., Suite 100 Westlake Village CA US 91362

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.