What this means
The IEEE assigned the MA-L block 18DFC1 to Aetheros. 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 18:DF:C1, it is Aetheros hardware.
Frequently Asked Questions
Who owns MAC prefix 18DFC1?
18DFC1 is registered to Aetheros 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. Aetheros's block covers 16,777,216 addresses.
What devices use 18DFC1?
Any network device with a MAC address starting 18:DF:C1 was manufactured by or for Aetheros.