What this means
The IEEE assigned the MA-L block E01333 to General Motors. 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 E0:13:33, it is General Motors hardware.
Frequently Asked Questions
Who owns MAC prefix E01333?
E01333 is registered to General Motors 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. General Motors's block covers 16,777,216 addresses.
What devices use E01333?
Any network device with a MAC address starting E0:13:33 was manufactured by or for General Motors.