Who owns MAC prefix ECFA03?

ECFA03 is registered to FCA in the IEEE MA-L registry.

What devices use ECFA03?

Any network device with a MAC address starting EC:FA:03 was manufactured by or for FCA.

MA-L · OUI prefix

FCA

Any MAC address starting EC:FA:03 is registered to FCA in US.

OUI prefix	ECFA03
Vendor	FCA
Registry	MA-L (24-bit, large block)
Country	US
Example MAC	EC:FA:03:00:00:00

What this means

The IEEE assigned the MA-L block ECFA03 to FCA. 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 EC:FA:03, it is FCA hardware.

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