Spotify USA Inc.

Any device whose MAC address begins with 30:E3:D6 has a network interface built by Spotify USA 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

30:E3:D6

Organization

Spotify USA Inc.

Address

45 West 18th Street New York NY US 10011

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.