What this means
The IEEE assigned the MA-L block A409CB to Alfred Kaercher GmbH & Co KG. 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 A4:09:CB, it is Alfred Kaercher GmbH & Co KG hardware.
Frequently Asked Questions
Who owns MAC prefix A409CB?
A409CB is registered to Alfred Kaercher GmbH & Co KG 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. Alfred Kaercher GmbH & Co KG's block covers 16,777,216 addresses.
What devices use A409CB?
Any network device with a MAC address starting A4:09:CB was manufactured by or for Alfred Kaercher GmbH & Co KG.