Who owns MAC prefix 00025B?

00025B is registered to Cambridge Silicon Radio in the IEEE MA-L registry.

What devices use 00025B?

Any network device with a MAC address starting 00:02:5B was manufactured by or for Cambridge Silicon Radio.

MA-L · OUI prefix

Cambridge Silicon Radio

Any MAC address starting 00:02:5B is registered to Cambridge Silicon Radio in GB.

OUI prefix	00025B
Vendor	Cambridge Silicon Radio
Registry	MA-L (24-bit, large block)
Country	GB
Example MAC	00:02:5B:00:00:00

What this means

The IEEE assigned the MA-L block 00025B to Cambridge Silicon Radio. 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 00:02:5B, it is Cambridge Silicon Radio hardware.

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