Who owns MAC prefix 00509B?

00509B is registered to SWITCHCORE AB in the IEEE MA-L registry.

What devices use 00509B?

Any network device with a MAC address starting 00:50:9B was manufactured by or for SWITCHCORE AB.

MA-L · OUI prefix

SWITCHCORE AB

Any MAC address starting 00:50:9B is registered to SWITCHCORE AB in SE.

OUI prefix	00509B
Vendor	SWITCHCORE AB
Registry	MA-L (24-bit, large block)
Country	SE
Example MAC	00:50:9B:00:00:00

What this means

The IEEE assigned the MA-L block 00509B to SWITCHCORE AB. 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 00:50:9B, it is SWITCHCORE AB hardware.

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