Who owns MAC prefix 00C343?

00C343 is registered to E-T-A Circuit Breakers Ltd in the IEEE MA-L registry.

What devices use 00C343?

Any network device with a MAC address starting 00:C3:43 was manufactured by or for E-T-A Circuit Breakers Ltd.

MA-L · OUI prefix

E-T-A Circuit Breakers Ltd

Any MAC address starting 00:C3:43 is registered to E-T-A Circuit Breakers Ltd in GB.

OUI prefix	00C343
Vendor	E-T-A Circuit Breakers Ltd
Registry	MA-L (24-bit, large block)
Country	GB
Example MAC	00:C3:43:00:00:00

What this means

The IEEE assigned the MA-L block 00C343 to E-T-A Circuit Breakers Ltd. 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:C3:43, it is E-T-A Circuit Breakers Ltd hardware.

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