ICANN, IANA Department

Any device whose MAC address begins with 00:00:5E has a network interface built by ICANN, IANA Department. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

00:00:5E

Organization

ICANN, IANA Department

Address

INTERNET ASS'NED NOS.AUTHORITY Los Angeles CA US 90094-2536

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.