What this means
The IEEE assigned the MA-L block 0021E4 to I-WIN. 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:E4, it is I-WIN hardware.
Frequently Asked Questions
Who owns MAC prefix 0021E4?
0021E4 is registered to I-WIN 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. I-WIN's block covers 16,777,216 addresses.
What devices use 0021E4?
Any network device with a MAC address starting 00:21:E4 was manufactured by or for I-WIN.