Adtran Inc

Any device whose MAC address begins with AC:51:EE has a network interface built by Adtran 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

AC:51:EE

Organization

Adtran Inc

Address

Sheraton House Cambridge Cambridgeshire GB CB3 0AX

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.