Hay Systems Ltd

Any device whose MAC address begins with AC:E9:AA has a network interface built by Hay Systems Ltd. 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:E9:AA

Organization

Hay Systems Ltd

Address

Watermark Livingston West Lothian GB EH54 7EG

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.