What this means
The IEEE assigned the MA-L block 28CB5C to Shenzhen CPETEK 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 28:CB:5C, it is Shenzhen CPETEK Technology Co.,Ltd. hardware.
Frequently Asked Questions
Who owns MAC prefix 28CB5C?
28CB5C is registered to Shenzhen CPETEK 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 CPETEK Technology Co.,Ltd.'s block covers 16,777,216 addresses.
What devices use 28CB5C?
Any network device with a MAC address starting 28:CB:5C was manufactured by or for Shenzhen CPETEK Technology Co.,Ltd..