Is there a way to find out the devices connected to your WiFi network?

any type of security should work.

1. change your SSID and don't broadcast it

and/or

2. filter out unwanted MAC addresses

and/or

3. enable WEP/WPA/etc. and set a password

you can reset the router usually by holding the reset button down for 30 seconds or something (it may be another key combination). this will take it back to the factory state with the factory IP and login.

No, you should either see what devices you have connected to your network via ethernet cables or using an external mobile device that is capable of connecting to wifi. If you think someone is using your wifi without you consent, put a password on the network through one of the computers that are connected to the network.

Usually, your router has a list of connected devices - though you may only be able to see their IP addresses or cryptic device names.

Open a browser, and connect to your router (the IP address is the one listed as DNS Server or Default Gateway in your network connection's properties, it usually starts with 192.168.... or 10.0... - just enter that IP address in your browser's address field). Once logged in, you should see a menu item "WLAN", "Devices" or "LAN Status" - that's what you are looking for.

You can go to the home page of your router in your browser, usually http://192.168.0.1/ or http://192.168.1.1/ (or http://172.16.0.1/ or http://172.16.1.1)/ if using a router. If using a wifi-modem directly connected to the line coming into the house, it should be http://192.168.1.100/

Look under network/dhcp and look for Active DHCP Leases. This will tell you the MAC addresses (and Windows host names if they are Windows machines) and IP assigned to all that are connected to your router. ARP Cache is a record of machines that have connected and disconnected though their DHCP leases are still active until the timeout period.

Log in to your router and look at the DHCP leases, it will tell you the MAC and IP address of all of the devices connected at that time, and sometimes the computer name as well.