who's router? Yours or a TWVC all in one combo?
For the latter go to 192.168.100.1 and on an ethernet wired connection.
You'll need to google the mfg's mod# to get the user/password.
Then, Go to wireless and see what mac's are there.
You should be running a home wireless network, not public wifi.
Turn off WPS, it can be hacked
How can I see who's connected to my wifi?
Do as MSR says you might see something like Client list or Lan Client list and name of computer or devices. Good call on WPS MSR I was just thinking about that today.