Diamanti

Any device whose MAC address begins with E8:66:C4 has a network interface built by Diamanti. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

E8:66:C4

Organization

Diamanti

Address

111 N. Market Street San Jose CA US 95113

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.