What this means
The IEEE assigned the MA-L block D47B6B to Shanghai Cygnus Semiconductor 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 D4:7B:6B, it is Shanghai Cygnus Semiconductor Co., Ltd. hardware.
Frequently Asked Questions
Who owns MAC prefix D47B6B?
D47B6B is registered to Shanghai Cygnus Semiconductor 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. Shanghai Cygnus Semiconductor Co., Ltd.'s block covers 16,777,216 addresses.
What devices use D47B6B?
Any network device with a MAC address starting D4:7B:6B was manufactured by or for Shanghai Cygnus Semiconductor Co., Ltd..