What this means
The IEEE assigned the MA-L block 004071 to ATM COMPUTER 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 00:40:71, it is ATM COMPUTER GMBH hardware.
Frequently Asked Questions
Who owns MAC prefix 004071?
004071 is registered to ATM COMPUTER 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. ATM COMPUTER GMBH's block covers 16,777,216 addresses.
What devices use 004071?
Any network device with a MAC address starting 00:40:71 was manufactured by or for ATM COMPUTER GMBH.