Who owns MAC prefix 542B57?

542B57 is registered to Night Owl SP in the IEEE MA-L registry.

What devices use 542B57?

Any network device with a MAC address starting 54:2B:57 was manufactured by or for Night Owl SP.

MA-L · OUI prefix

Night Owl SP

Any MAC address starting 54:2B:57 is registered to Night Owl SP in US.

OUI prefix	542B57
Vendor	Night Owl SP
Registry	MA-L (24-bit, large block)
Country	US
Example MAC	54:2B:57:00:00:00

What this means

The IEEE assigned the MA-L block 542B57 to Night Owl SP. 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 54:2B:57, it is Night Owl SP hardware.

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