What this means
The IEEE assigned the MA-L block 00219D to Adesys BV. 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 00:21:9D, it is Adesys BV hardware.
Frequently Asked Questions
Who owns MAC prefix 00219D?
00219D is registered to Adesys BV 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. Adesys BV's block covers 16,777,216 addresses.
What devices use 00219D?
Any network device with a MAC address starting 00:21:9D was manufactured by or for Adesys BV.