Vanu Inc.

Any device whose MAC address begins with 18:A4:A9 has a network interface built by Vanu 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

18:A4:A9

Organization

Vanu Inc.

Address

81 Hartwell Ave Lexington MA US 02421

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.