ITALTEL S.p.A/RF-UP-I

Any device whose MAC address begins with 00:01:5B has a network interface built by ITALTEL S.p.A/RF-UP-I. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:01:5B

Organization

ITALTEL S.p.A/RF-UP-I

Address

20019 Cast.Settimo M.se (MI) IT

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.