Coster T.E. S.P.A.

Any device whose MAC address begins with B4:89:10 has a network interface built by Coster T.E. S.P.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

B4:89:10

Organization

Coster T.E. S.P.A.

Address

Via San Giovanni Battista De La Salle 4/a Milano MI IT 20132

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.