Grammar Engine Inc.

Any device whose MAC address begins with 00:05:93 has a network interface built by Grammar Engine 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

00:05:93

Organization

Grammar Engine Inc.

Address

921 Eastwind Drive Westerville OH US 43081

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.