What this means
The IEEE assigned the MA-L block 640DE6 to Petra Systems. 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 64:0D:E6, it is Petra Systems hardware.
Frequently Asked Questions
Who owns MAC prefix 640DE6?
640DE6 is registered to Petra Systems 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. Petra Systems's block covers 16,777,216 addresses.
What devices use 640DE6?
Any network device with a MAC address starting 64:0D:E6 was manufactured by or for Petra Systems.