SMS TECNOLOGIA ELETRONICA LTDA

Any device whose MAC address begins with 00:21:CB has a network interface built by SMS TECNOLOGIA ELETRONICA 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

00:21:CB

Organization

SMS TECNOLOGIA ELETRONICA LTDA

Address

Av. Pirâmide, 661 DIADEMA São Paulo BR 09970330

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.