Who owns MAC prefix 400589?

400589 is registered to T-Mobile, USA in the IEEE MA-L registry.

What devices use 400589?

Any network device with a MAC address starting 40:05:89 was manufactured by or for T-Mobile, USA.

MA-L · OUI prefix

T-Mobile, USA

Any MAC address starting 40:05:89 is registered to T-Mobile, USA in US.

OUI prefix	400589
Vendor	T-Mobile, USA
Registry	MA-L (24-bit, large block)
Country	US
Example MAC	40:05:89:00:00:00

What this means

The IEEE assigned the MA-L block 400589 to T-Mobile, USA. 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 40:05:89, it is T-Mobile, USA hardware.

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