What this means
The IEEE assigned the MA-L block 004004 to ICM 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 00:40:04, it is ICM CO. LTD. hardware.
Frequently Asked Questions
Who owns MAC prefix 004004?
004004 is registered to ICM 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. ICM CO. LTD.'s block covers 16,777,216 addresses.
What devices use 004004?
Any network device with a MAC address starting 00:40:04 was manufactured by or for ICM CO. LTD..