What this means
The IEEE assigned the MA-L block 0021D4 to Vollmer Werke 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 00:21:D4, it is Vollmer Werke GmbH hardware.
Frequently Asked Questions
Who owns MAC prefix 0021D4?
0021D4 is registered to Vollmer Werke 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. Vollmer Werke GmbH's block covers 16,777,216 addresses.
What devices use 0021D4?
Any network device with a MAC address starting 00:21:D4 was manufactured by or for Vollmer Werke GmbH.