What this means
The IEEE assigned the MA-L block 5CF9DD to Dell Inc.. 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:F9:DD, it is Dell Inc. hardware.
Frequently Asked Questions
Who owns MAC prefix 5CF9DD?
5CF9DD is registered to Dell Inc. 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. Dell Inc.'s block covers 16,777,216 addresses.
What devices use 5CF9DD?
Any network device with a MAC address starting 5C:F9:DD was manufactured by or for Dell Inc..