Who owns MAC prefix 3C39E73?

3C39E73 is registered to ELSA Japan Inc. in the IEEE MA-M registry.

What devices use 3C39E73?

Any network device with a MAC address starting 3C:39:E7:3 was manufactured by or for ELSA Japan Inc..

MA-M · OUI prefix

ELSA Japan Inc.

Any MAC address starting 3C:39:E7:3 is registered to ELSA Japan Inc. in JP.

OUI prefix	3C39E73
Vendor	ELSA Japan Inc.
Registry	MA-M (28-bit, medium block)
Country	JP
Example MAC	3C:39:E7:3:00:00:00

What this means

The IEEE assigned the MA-M block 3C39E73 to ELSA Japan 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 3C:39:E7:3, it is ELSA Japan Inc. hardware.

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