Tools for Humanity Corporation

Any device whose MAC address begins with A4:61:85 has a network interface built by Tools for Humanity Corporation. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

A4:61:85

Organization

Tools for Humanity Corporation

Address

650 7th St San Francisco CA US 94103

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.