SM Optics S.r.l.

Any device whose MAC address begins with 04:3A:0D has a network interface built by SM Optics S.r.l.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

04:3A:0D

Organization

SM Optics S.r.l.

Address

via Michelangelo Buonarroti, 1 Cologno Monzese Milan IT I-20093

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.