What this means
The IEEE assigned the MA-L block 1C721D 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 1C:72:1D, it is Dell Inc. hardware.
Frequently Asked Questions
Who owns MAC prefix 1C721D?
1C721D 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 1C721D?
Any network device with a MAC address starting 1C:72:1D was manufactured by or for Dell Inc..