Who owns MAC prefix 504A5E?

504A5E is registered to Masimo Corporation in the IEEE MA-L registry.

What devices use 504A5E?

Any network device with a MAC address starting 50:4A:5E was manufactured by or for Masimo Corporation.

MA-L · OUI prefix

Masimo Corporation

Any MAC address starting 50:4A:5E is registered to Masimo Corporation in US.

OUI prefix	504A5E
Vendor	Masimo Corporation
Registry	MA-L (24-bit, large block)
Country	US
Example MAC	50:4A:5E:00:00:00

What this means

The IEEE assigned the MA-L block 504A5E to Masimo Corporation. 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 50:4A:5E, it is Masimo Corporation hardware.

Other Masimo Corporation prefixes

Masimo Corporation holds 7 registered blocks in total.

8809AF B810D4 C022F1E C816A5 C88BE8 E0C2B7

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