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