Who owns MAC prefix 0040FB?

0040FB is registered to CASCADE COMMUNICATIONS in the IEEE MA-L registry.

What devices use 0040FB?

Any network device with a MAC address starting 00:40:FB was manufactured by or for CASCADE COMMUNICATIONS.

MA-L · OUI prefix

CASCADE COMMUNICATIONS

Any MAC address starting 00:40:FB is registered to CASCADE COMMUNICATIONS in US.

OUI prefix	0040FB
Vendor	CASCADE COMMUNICATIONS
Registry	MA-L (24-bit, large block)
Country	US
Example MAC	00:40:FB:00:00:00

What this means

The IEEE assigned the MA-L block 0040FB to CASCADE COMMUNICATIONS. 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 00:40:FB, it is CASCADE COMMUNICATIONS hardware.

Other CASCADE COMMUNICATIONS prefixes

CASCADE COMMUNICATIONS holds 2 registered blocks in total.

0060D1

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