Who owns MAC prefix 004039?

004039 is registered to OPTEC DAIICHI DENKO CO., LTD. in the IEEE MA-L registry.

What devices use 004039?

Any network device with a MAC address starting 00:40:39 was manufactured by or for OPTEC DAIICHI DENKO CO., LTD..

MA-L · OUI prefix

OPTEC DAIICHI DENKO CO., LTD.

Any MAC address starting 00:40:39 is registered to OPTEC DAIICHI DENKO CO., LTD..

OUI prefix	004039
Vendor	OPTEC DAIICHI DENKO CO., LTD.
Registry	MA-L (24-bit, large block)
Example MAC	00:40:39:00:00:00

What this means

The IEEE assigned the MA-L block 004039 to OPTEC DAIICHI DENKO CO., 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 00:40:39, it is OPTEC DAIICHI DENKO CO., LTD. hardware.

Look up another MAC