Fitbit, Inc.

Any device whose MAC address begins with 58:A8:7B has a network interface built by Fitbit, 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

58:A8:7B

Organization

Fitbit, Inc.

Address

199 Fremont Street, 14th Fl San Francisco CA US 94105

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.