What this means
The IEEE assigned the MA-L block 004000 to PCI COMPONENTES DA AMZONIA LTD. 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 00:40:00, it is PCI COMPONENTES DA AMZONIA LTD hardware.
Frequently Asked Questions
Who owns MAC prefix 004000?
004000 is registered to PCI COMPONENTES DA AMZONIA LTD 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. PCI COMPONENTES DA AMZONIA LTD's block covers 16,777,216 addresses.
What devices use 004000?
Any network device with a MAC address starting 00:40:00 was manufactured by or for PCI COMPONENTES DA AMZONIA LTD.