Who owns MAC prefix 00194A?

00194A is registered to TESTO AG in the IEEE MA-L registry.

What devices use 00194A?

Any network device with a MAC address starting 00:19:4A was manufactured by or for TESTO AG.

MA-L · OUI prefix

TESTO AG

Any MAC address starting 00:19:4A is registered to TESTO AG in DE.

OUI prefix	00194A
Vendor	TESTO AG
Registry	MA-L (24-bit, large block)
Country	DE
Example MAC	00:19:4A:00:00:00

What this means

The IEEE assigned the MA-L block 00194A to TESTO AG. 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 00:19:4A, it is TESTO AG hardware.

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