Si14 SpA

Any device whose MAC address begins with 00:21:F3 has a network interface built by Si14 SpA. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:21:F3

Organization

Si14 SpA

Address

Via Tommaseo 77 Padova PD IT 35131

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.