Who owns MAC prefix 004033?

004033 is registered to ADDTRON TECHNOLOGY CO., LTD. in the IEEE MA-L registry.

What devices use 004033?

Any network device with a MAC address starting 00:40:33 was manufactured by or for ADDTRON TECHNOLOGY CO., LTD..

MA-L · OUI prefix

ADDTRON TECHNOLOGY CO., LTD.

Any MAC address starting 00:40:33 is registered to ADDTRON TECHNOLOGY CO., LTD. in US.

OUI prefix	004033
Vendor	ADDTRON TECHNOLOGY CO., LTD.
Registry	MA-L (24-bit, large block)
Country	US
Example MAC	00:40:33:00:00:00

What this means

The IEEE assigned the MA-L block 004033 to ADDTRON TECHNOLOGY 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 00:40:33, it is ADDTRON TECHNOLOGY CO., LTD. hardware.

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