What this means
The IEEE assigned the MA-L block 28CCFF to Corporacion Empresarial Altra SL. 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 28:CC:FF, it is Corporacion Empresarial Altra SL hardware.
Frequently Asked Questions
Who owns MAC prefix 28CCFF?
28CCFF is registered to Corporacion Empresarial Altra SL 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. Corporacion Empresarial Altra SL's block covers 16,777,216 addresses.
What devices use 28CCFF?
Any network device with a MAC address starting 28:CC:FF was manufactured by or for Corporacion Empresarial Altra SL.