What this means
The IEEE assigned the MA-L block 3C3B4D to Toyo Seisakusho Kaisha, Limited. 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 3C:3B:4D, it is Toyo Seisakusho Kaisha, Limited hardware.
Frequently Asked Questions
Who owns MAC prefix 3C3B4D?
3C3B4D is registered to Toyo Seisakusho Kaisha, Limited 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. Toyo Seisakusho Kaisha, Limited's block covers 16,777,216 addresses.
What devices use 3C3B4D?
Any network device with a MAC address starting 3C:3B:4D was manufactured by or for Toyo Seisakusho Kaisha, Limited.