What this means
The IEEE assigned the MA-L block C4047B to Shenzhen YOUHUA 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 C4:04:7B, it is Shenzhen YOUHUA Technology Co., Ltd hardware.
Frequently Asked Questions
Who owns MAC prefix C4047B?
C4047B is registered to Shenzhen YOUHUA 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. Shenzhen YOUHUA Technology Co., Ltd's block covers 16,777,216 addresses.
What devices use C4047B?
Any network device with a MAC address starting C4:04:7B was manufactured by or for Shenzhen YOUHUA Technology Co., Ltd.