I an looking for an adapter - from USB to Ethernet?

Question

Let me explain.

I want to plug a USB device into the adapter and plug the adapter into my router

Answer 1

Actually, adapters for that do exist.

http://www.amazon.co.uk/Belkin-Ethernet-...

Answer 2

I don't think there exists one like that. The only ones I could find are the ones like Goffik found.

Answer 3

Your explanation isn't helping things.  What USB device, and why are you trying to do it?

I'm not the biggest computer nerd of all time, but that doesn't even sound possible.  USB is for transferring data, and Ethernet is your network connection.  Those are two completely different things.