Cray, Inc.

Any device whose MAC address begins with 00:40:A6 has a network interface built by Cray, 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

00:40:A6

Organization

Cray, Inc.

Address

655F LONE OAK DRIVE EAGAN MN US 55121

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.