Square Inc.

Any device whose MAC address begins with 44:59:25 has a network interface built by Square 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

44:59:25

Organization

Square Inc.

Address

1455 Market 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.