Meta Platforms, Inc.

Any device whose MAC address begins with 84:57:F7 has a network interface built by Meta Platforms, 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

84:57:F7

Organization

Meta Platforms, Inc.

Address

1601 Willow Rd Menlo Park CA US 94025

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.