How to tell if someone is using my internet connection?

[orion23]

Hi,
I have a wireless router and use WPA encryption so I'm hoping to be OK.
I just want to know where to look for information that would tell me if someone has been using my connection. How can I tell, who? and when?

TIA!

 

[skadoo323]

usually when you log into your router's admin config setup you can see any mac addresses of devices connected to your network, some even show the PC's name

 

[JackMDS]

Look at the Router's DHCP server and see if you have extra IP/MAC that does not belong to your system.

:sun: