2EI

Any device whose MAC address begins with 00:16:A9 has a network interface built by 2EI. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:16:A9

Organization

2EI

Address

Rua dos Rubis, 77 - Assumpcao Aguas de Lindoia São Paulo BR 13940-000

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.