ENT-EMPRESA NACIONAL DE TELECOMMUNICACOES, S.A.

Any device whose MAC address begins with 00:90:CD has a network interface built by ENT-EMPRESA NACIONAL DE TELECOMMUNICACOES, S.A.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:90:CD

Organization

ENT-EMPRESA NACIONAL DE TELECOMMUNICACOES, S.A.

Address

R. ENG FREDERICO ULRICH - APARTADO 3081 Guardeiras - 4470 Moreira Maia PT

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.