What this means
The IEEE assigned the MA-L block 7C66EF to Hon Hai Precision IND.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 7C:66:EF, it is Hon Hai Precision IND.CO.,LTD hardware.
Frequently Asked Questions
Who owns MAC prefix 7C66EF?
7C66EF is registered to Hon Hai Precision IND.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. Hon Hai Precision IND.CO.,LTD's block covers 16,777,216 addresses.
What devices use 7C66EF?
Any network device with a MAC address starting 7C:66:EF was manufactured by or for Hon Hai Precision IND.CO.,LTD.