What this means
The IEEE assigned the MA-L block 8891DD to Racktivity. 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 88:91:DD, it is Racktivity hardware.
Frequently Asked Questions
Who owns MAC prefix 8891DD?
8891DD is registered to Racktivity 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. Racktivity's block covers 16,777,216 addresses.
What devices use 8891DD?
Any network device with a MAC address starting 88:91:DD was manufactured by or for Racktivity.