What this means
The IEEE assigned the MA-L block 004055 to METRONIX GMBH. 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 00:40:55, it is METRONIX GMBH hardware.
Frequently Asked Questions
Who owns MAC prefix 004055?
004055 is registered to METRONIX GMBH 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. METRONIX GMBH's block covers 16,777,216 addresses.
What devices use 004055?
Any network device with a MAC address starting 00:40:55 was manufactured by or for METRONIX GMBH.