Alfa Instrumentos Eletronicos Ltda.

Any device whose MAC address begins with 70:53:3F has a network interface built by Alfa Instrumentos Eletronicos Ltda.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

70:53:3F

Organization

Alfa Instrumentos Eletronicos Ltda.

Address

Rua Coronel Mario de Azevedo, 138 Sao Paulo SP BR 02710-020

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.