What this means
The IEEE assigned the MA-L block 18C451 to Tucson Embedded Systems. 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 18:C4:51, it is Tucson Embedded Systems hardware.
Frequently Asked Questions
Who owns MAC prefix 18C451?
18C451 is registered to Tucson Embedded Systems 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. Tucson Embedded Systems's block covers 16,777,216 addresses.
What devices use 18C451?
Any network device with a MAC address starting 18:C4:51 was manufactured by or for Tucson Embedded Systems.