Who owns MAC prefix 3440B5?

3440B5 is registered to IBM in the IEEE MA-L registry.

What devices use 3440B5?

Any network device with a MAC address starting 34:40:B5 was manufactured by or for IBM.

MA-L · OUI prefix

IBM

Any MAC address starting 34:40:B5 is registered to IBM in US.

OUI prefix	3440B5
Vendor	IBM
Registry	MA-L (24-bit, large block)
Country	US
Example MAC	34:40:B5:00:00:00

What this means

The IEEE assigned the MA-L block 3440B5 to IBM. 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 34:40:B5, it is IBM hardware.

Other IBM prefixes

IBM holds 7 registered blocks in total.

2C691D8 40F2E9 904E917 98BE94 A897DC C4FF848

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