TomTom Software Ltd

Any device whose MAC address begins with E4:04:39 has a network interface built by TomTom Software Ltd. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address.

OUI prefix

E4:04:39

Organization

TomTom Software Ltd

Address

20th Floor Euston Tower London GB NW1 3AS

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.