What this means
The IEEE assigned the MA-M block 90F421A to Proqualit Telecom LTDA. 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:A, it is Proqualit Telecom LTDA hardware.
Frequently Asked Questions
Who owns MAC prefix 90F421A?
90F421A is registered to Proqualit Telecom LTDA 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. Proqualit Telecom LTDA's block covers 1,048,576 addresses.
What devices use 90F421A?
Any network device with a MAC address starting 90:F4:21:A was manufactured by or for Proqualit Telecom LTDA.