Who owns MAC prefix D420000?

D420000 is registered to Wattsense in the IEEE MA-M registry.

What devices use D420000?

Any network device with a MAC address starting D4:20:00:0 was manufactured by or for Wattsense.

MA-M · OUI prefix

Wattsense

Any MAC address starting D4:20:00:0 is registered to Wattsense in FR.

OUI prefix	D420000
Vendor	Wattsense
Registry	MA-M (28-bit, medium block)
Country	FR
Example MAC	D4:20:00:0:00:00:00

What this means

The IEEE assigned the MA-M block D420000 to Wattsense. 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 D4:20:00:0, it is Wattsense hardware.

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