What this means
The IEEE assigned the MA-L block 5041B9 to I-O DATA, 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 50:41:B9, it is I-O DATA, INC. hardware.
Frequently Asked Questions
Who owns MAC prefix 5041B9?
5041B9 is registered to I-O DATA, 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. I-O DATA, INC.'s block covers 16,777,216 addresses.
What devices use 5041B9?
Any network device with a MAC address starting 50:41:B9 was manufactured by or for I-O DATA, INC..