What this means
The IEEE assigned the MA-L block A05B21 to ENVINET 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 A0:5B:21, it is ENVINET GmbH hardware.
Frequently Asked Questions
Who owns MAC prefix A05B21?
A05B21 is registered to ENVINET 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. ENVINET GmbH's block covers 16,777,216 addresses.
What devices use A05B21?
Any network device with a MAC address starting A0:5B:21 was manufactured by or for ENVINET GmbH.