What this means
The IEEE assigned the MA-L block 0040F2 to JANICH & KLASS COMPUTERTECHNIK. 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:F2, it is JANICH & KLASS COMPUTERTECHNIK hardware.
Frequently Asked Questions
Who owns MAC prefix 0040F2?
0040F2 is registered to JANICH & KLASS COMPUTERTECHNIK 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. JANICH & KLASS COMPUTERTECHNIK's block covers 16,777,216 addresses.
What devices use 0040F2?
Any network device with a MAC address starting 00:40:F2 was manufactured by or for JANICH & KLASS COMPUTERTECHNIK.