Who owns MAC prefix 000521?

000521 is registered to Schneider Electric in the IEEE MA-L registry.

What devices use 000521?

Any network device with a MAC address starting 00:05:21 was manufactured by or for Schneider Electric.

MA-L · OUI prefix

Schneider Electric

Any MAC address starting 00:05:21 is registered to Schneider Electric in CA.

OUI prefix	000521
Vendor	Schneider Electric
Registry	MA-L (24-bit, large block)
Country	CA
Example MAC	00:05:21:00:00:00

What this means

The IEEE assigned the MA-L block 000521 to Schneider Electric. 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 00:05:21, it is Schneider Electric hardware.

Other Schneider Electric prefixes

Schneider Electric holds 8 registered blocks in total.

000054 00006C 000374 000417 001100 008DF45 9C0E51

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