Redes de Telefonía Móvil S.A.

Any device whose MAC address begins with 00:13:89 has a network interface built by Redes de Telefonía Móvil 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

00:13:89

Organization

Redes de Telefonía Móvil S.A.

Address

C/Puerto de la Morcuera 14 B4 Leganés Madrid ES 28918

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.