Who owns MAC prefix 7CDDE9?

7CDDE9 is registered to ATOM tech Inc. in the IEEE MA-L registry.

What devices use 7CDDE9?

Any network device with a MAC address starting 7C:DD:E9 was manufactured by or for ATOM tech Inc..

MA-L · OUI prefix

ATOM tech Inc.

Any MAC address starting 7C:DD:E9 is registered to ATOM tech Inc. in JP.

OUI prefix	7CDDE9
Vendor	ATOM tech Inc.
Registry	MA-L (24-bit, large block)
Country	JP
Example MAC	7C:DD:E9:00:00:00

What this means

The IEEE assigned the MA-L block 7CDDE9 to ATOM tech Inc.. 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 7C:DD:E9, it is ATOM tech Inc. hardware.

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