Who owns MAC prefix B81F3F?

B81F3F is registered to Espressif Inc. in the IEEE MA-L registry.

What devices use B81F3F?

Any network device with a MAC address starting B8:1F:3F was manufactured by or for Espressif Inc..

MA-L · OUI prefix

Espressif Inc.

Any MAC address starting B8:1F:3F is registered to Espressif Inc. in VG.

OUI prefix	B81F3F
Vendor	Espressif Inc.
Registry	MA-L (24-bit, large block)
Country	VG
Example MAC	B8:1F:3F:00:00:00

What this means

The IEEE assigned the MA-L block B81F3F to Espressif Inc.. 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 B8:1F:3F, it is Espressif Inc. hardware.

Other Espressif Inc. prefixes

Espressif Inc. holds 335 registered blocks in total.

004B12 007007 048308 04B247 083A8D 083AF2 089272 08A6F7 08AD0A 08B61F 08D1F9 08F9E0 all 335 »

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