How do i find who is using my wifi?

I had a day this month where almost 28gb was used of my download and can't epxlain it, how do i find out who uses my wifi?

You cannot see that readily from your Mac, but you should be able to tell by logging into your wifi router.  It likely uses a web page for administration, and from that, you should be able to find a list of all connected devices.  To see actual activity, you may need to access or enable logging, if your router supports it.
Check your router's manual for how to access those sorts of admin features.

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