Data Management, Inc.

Any device whose MAC address begins with 40:AC:8D has a network interface built by Data Management, 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

40:AC:8D

Organization

Data Management, Inc.

Address

3322 Loop 306 San Angelo Texas US 76904

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.