[ahofmann]

Good routers show usage by device. I don't know, why the sibling answer is dead, but ubiquity routers seem to have this feature. Mikrotik and keenetic are other routers, that are capable of that. Maybe recent Fritzbox routers too.

[Propelloni]

That's surprising. The last time I ran a Fritzbox was in 2012 and I think it was capable of doing that. I think virtually all routers showed these kinds of statistics back then. I'm on OpenWRT the last five or so years, so I haven't kept up, has this changed?

[mns]

On Fritzbox you need to enable it for each device individually. Good thing I saw this post, as I wanted to check out what some of my appliances are doing and enabled it for a few of them a month ago.