What this means
The IEEE assigned the MA-L block 40B3CD to Chiyoda Electronics Co.,Ltd.. 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 40:B3:CD, it is Chiyoda Electronics Co.,Ltd. hardware.
Frequently Asked Questions
Who owns MAC prefix 40B3CD?
40B3CD is registered to Chiyoda Electronics Co.,Ltd. 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. Chiyoda Electronics Co.,Ltd.'s block covers 16,777,216 addresses.
What devices use 40B3CD?
Any network device with a MAC address starting 40:B3:CD was manufactured by or for Chiyoda Electronics Co.,Ltd..