What this means
The IEEE assigned the MA-L block 3C9FC3 to Beijing Sinead Technology 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 3C:9F:C3, it is Beijing Sinead Technology Co., Ltd. hardware.
Frequently Asked Questions
Who owns MAC prefix 3C9FC3?
3C9FC3 is registered to Beijing Sinead Technology 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. Beijing Sinead Technology Co., Ltd.'s block covers 16,777,216 addresses.
What devices use 3C9FC3?
Any network device with a MAC address starting 3C:9F:C3 was manufactured by or for Beijing Sinead Technology Co., Ltd..