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