RealNetworks

Any device whose MAC address begins with C0:E9:11 has a network interface built by RealNetworks. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

C0:E9:11

Organization

RealNetworks

Address

568 1st Avenue S. Suite 600 Seattle WA US 98104

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.