Symbolic IO

Any device whose MAC address begins with D4:CF:37 has a network interface built by Symbolic IO. 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:CF:37

Organization

Symbolic IO

Address

101 Crawfords Corner Rd. Holmdel NJ US 07733

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.