What this means
The IEEE assigned the MA-M block 5CF838D to Watts A\S. 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 5C:F8:38:D, it is Watts A\S hardware.
Frequently Asked Questions
Who owns MAC prefix 5CF838D?
5CF838D is registered to Watts A\S 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. Watts A\S's block covers 1,048,576 addresses.
What devices use 5CF838D?
Any network device with a MAC address starting 5C:F8:38:D was manufactured by or for Watts A\S.