What this means
The IEEE assigned the MA-L block 004091 to PROCOMP INDUSTRIA ELETRONICA. 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 00:40:91, it is PROCOMP INDUSTRIA ELETRONICA hardware.
Frequently Asked Questions
Who owns MAC prefix 004091?
004091 is registered to PROCOMP INDUSTRIA ELETRONICA 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. PROCOMP INDUSTRIA ELETRONICA's block covers 16,777,216 addresses.
What devices use 004091?
Any network device with a MAC address starting 00:40:91 was manufactured by or for PROCOMP INDUSTRIA ELETRONICA.