What this means
The IEEE assigned the MA-L block E40439 to TomTom Software Ltd. Every network interface they manufacture under this block has a MAC address beginning with these digits, followed by a unique per-device identifier. If a device on your network shows a MAC starting E4:04:39, it is TomTom Software Ltd hardware.
Frequently Asked Questions
Who owns MAC prefix E40439?
E40439 is registered to TomTom Software Ltd in the IEEE MA-L registry.
What does the MA-L registry type mean?
An MA-L assignment, the IEEE's original OUI format, gives the vendor the first three octets and 16,777,216 device addresses under them. TomTom Software Ltd's block covers 16,777,216 addresses.
What devices use E40439?
Any network device with a MAC address starting E4:04:39 was manufactured by or for TomTom Software Ltd.