What this means
The IEEE assigned the MA-L block 28D0CB to Adtran Inc. 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:D0:CB, it is Adtran Inc hardware.
Frequently Asked Questions
Who owns MAC prefix 28D0CB?
28D0CB is registered to Adtran Inc 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. Adtran Inc's block covers 16,777,216 addresses.
What devices use 28D0CB?
Any network device with a MAC address starting 28:D0:CB was manufactured by or for Adtran Inc.