Who owns MAC prefix 00407D?

00407D is registered to EXTENSION TECHNOLOGY CORP. in the IEEE MA-L registry.

What devices use 00407D?

Any network device with a MAC address starting 00:40:7D was manufactured by or for EXTENSION TECHNOLOGY CORP..

MA-L · OUI prefix

EXTENSION TECHNOLOGY CORP.

Any MAC address starting 00:40:7D is registered to EXTENSION TECHNOLOGY CORP. in US.

OUI prefix	00407D
Vendor	EXTENSION TECHNOLOGY CORP.
Registry	MA-L (24-bit, large block)
Country	US
Example MAC	00:40:7D:00:00:00

What this means

The IEEE assigned the MA-L block 00407D to EXTENSION TECHNOLOGY CORP.. 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 00:40:7D, it is EXTENSION TECHNOLOGY CORP. hardware.

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