What this means
The IEEE assigned the MA-L block 74B472 to CIESSE. 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:B4:72, it is CIESSE hardware.
Frequently Asked Questions
Who owns MAC prefix 74B472?
74B472 is registered to CIESSE 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. CIESSE's block covers 16,777,216 addresses.
What devices use 74B472?
Any network device with a MAC address starting 74:B4:72 was manufactured by or for CIESSE.