GL Communications Inc

Any device whose MAC address begins with 00:21:C2 has a network interface built by GL Communications 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

00:21:C2

Organization

GL Communications Inc

Address

818 West Diamond Ave Gaithersburg MD US 20878

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.