What this means
The IEEE assigned the MA-L block 1C43EC to JAPAN CIRCUIT 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 1C:43:EC, it is JAPAN CIRCUIT CO.,LTD hardware.
Frequently Asked Questions
Who owns MAC prefix 1C43EC?
1C43EC is registered to JAPAN CIRCUIT 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. JAPAN CIRCUIT CO.,LTD's block covers 16,777,216 addresses.
What devices use 1C43EC?
Any network device with a MAC address starting 1C:43:EC was manufactured by or for JAPAN CIRCUIT CO.,LTD.