What this means
The IEEE assigned the MA-L block 84C3E8 to Vaillant GmbH. 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 84:C3:E8, it is Vaillant GmbH hardware.
Frequently Asked Questions
Who owns MAC prefix 84C3E8?
84C3E8 is registered to Vaillant GmbH 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. Vaillant GmbH's block covers 16,777,216 addresses.
What devices use 84C3E8?
Any network device with a MAC address starting 84:C3:E8 was manufactured by or for Vaillant GmbH.