What this means
The IEEE assigned the MA-M block 90F421B to Jiangsu MSInfo 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 90:F4:21:B, it is Jiangsu MSInfo Technology Co.,Ltd. hardware.
Frequently Asked Questions
Who owns MAC prefix 90F421B?
90F421B is registered to Jiangsu MSInfo Technology Co.,Ltd. in the IEEE MA-M registry.
What does the MA-M registry type mean?
An MA-M assignment covers 28 bits of the address, giving the vendor 1,048,576 device addresses, a quarter of a full MA-L block. Jiangsu MSInfo Technology Co.,Ltd.'s block covers 1,048,576 addresses.
What devices use 90F421B?
Any network device with a MAC address starting 90:F4:21:B was manufactured by or for Jiangsu MSInfo Technology Co.,Ltd..