What this means
The IEEE assigned the MA-L block D491AF to Electroacustica General Iberica, S.A.. 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 D4:91:AF, it is Electroacustica General Iberica, S.A. hardware.
Frequently Asked Questions
Who owns MAC prefix D491AF?
D491AF is registered to Electroacustica General Iberica, S.A. 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. Electroacustica General Iberica, S.A.'s block covers 16,777,216 addresses.
What devices use D491AF?
Any network device with a MAC address starting D4:91:AF was manufactured by or for Electroacustica General Iberica, S.A..