What this means
The IEEE assigned the MA-L block 7CB21B to Cisco SPVTG. 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 7C:B2:1B, it is Cisco SPVTG hardware.
Frequently Asked Questions
Who owns MAC prefix 7CB21B?
7CB21B is registered to Cisco SPVTG 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. Cisco SPVTG's block covers 16,777,216 addresses.
What devices use 7CB21B?
Any network device with a MAC address starting 7C:B2:1B was manufactured by or for Cisco SPVTG.