Who owns MAC prefix A4E991?

A4E991 is registered to SISTEMAS AUDIOVISUALES ITELSIS S.L. in the IEEE MA-L registry.

What devices use A4E991?

Any network device with a MAC address starting A4:E9:91 was manufactured by or for SISTEMAS AUDIOVISUALES ITELSIS S.L..

MA-L · OUI prefix

SISTEMAS AUDIOVISUALES ITELSIS S.L.

Any MAC address starting A4:E9:91 is registered to SISTEMAS AUDIOVISUALES ITELSIS S.L. in ES.

OUI prefix	A4E991
Vendor	SISTEMAS AUDIOVISUALES ITELSIS S.L.
Registry	MA-L (24-bit, large block)
Country	ES
Example MAC	A4:E9:91:00:00:00

What this means

The IEEE assigned the MA-L block A4E991 to SISTEMAS AUDIOVISUALES ITELSIS S.L.. 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 A4:E9:91, it is SISTEMAS AUDIOVISUALES ITELSIS S.L. hardware.

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