Insight Energy Ventures LLC

Any device whose MAC address begins with 04:21:4C has a network interface built by Insight Energy Ventures LLC. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

04:21:4C

Organization

Insight Energy Ventures LLC

Address

123 W. Fifth St Royal Oak MI US 48067

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.