What this means
The IEEE assigned the MA-L block 00129B to E2S Electronic Engineering Solutions, S.L.. 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 00:12:9B, it is E2S Electronic Engineering Solutions, S.L. hardware.
Frequently Asked Questions
Who owns MAC prefix 00129B?
00129B is registered to E2S Electronic Engineering Solutions, S.L. 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. E2S Electronic Engineering Solutions, S.L.'s block covers 16,777,216 addresses.
What devices use 00129B?
Any network device with a MAC address starting 00:12:9B was manufactured by or for E2S Electronic Engineering Solutions, S.L..