What this means
The IEEE assigned the MA-L block 281B04 to Zalliant 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 28:1B:04, it is Zalliant LLC hardware.
Frequently Asked Questions
Who owns MAC prefix 281B04?
281B04 is registered to Zalliant 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. Zalliant LLC's block covers 16,777,216 addresses.
What devices use 281B04?
Any network device with a MAC address starting 28:1B:04 was manufactured by or for Zalliant LLC.