Who owns MAC prefix 1CFF3F?

1CFF3F is registered to Cust2mate in the IEEE MA-L registry.

What devices use 1CFF3F?

Any network device with a MAC address starting 1C:FF:3F was manufactured by or for Cust2mate.

MA-L · OUI prefix

Cust2mate

Any MAC address starting 1C:FF:3F is registered to Cust2mate in IL.

OUI prefix	1CFF3F
Vendor	Cust2mate
Registry	MA-L (24-bit, large block)
Country	IL
Example MAC	1C:FF:3F:00:00:00

What this means

The IEEE assigned the MA-L block 1CFF3F to Cust2mate. 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 1C:FF:3F, it is Cust2mate hardware.

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