What this means
The IEEE assigned the MA-L block 74547D 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 74:54:7D, it is Cisco SPVTG hardware.
Frequently Asked Questions
Who owns MAC prefix 74547D?
74547D 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 74547D?
Any network device with a MAC address starting 74:54:7D was manufactured by or for Cisco SPVTG.