Energotest

Any device whose MAC address begins with E8:E1:E2 has a network interface built by Energotest. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

E8:E1:E2

Organization

Energotest

Address

Chorzowska 44B Gliwice Slask PL 44-100

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.