A free app for Android, by coreno.
In order to use this app, you have to connect to the Internet. The connection must be stable and you must not be on a public network (e.g. 3G).
Once you have connected, the app will list all available IP addresses of your router.
If you click on one of them, a web browser will open and the address will be listed in the address bar.
You can find many settings in the web browser.
This app can be used to check your router settings, but also to configure the settings. You can configure your settings to send a specific signal to your router, to open a specific port, etc.