TELNET Redes Inteligentes S.A.

Any device whose MAC address begins with 78:3D:5B has a network interface built by TELNET Redes Inteligentes 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

78:3D:5B

Organization

TELNET Redes Inteligentes S.A.

Address

Polígono Industrial Centrovía La Muela Zaragoza ES 50198

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.