Fing is one of the best-known and most-used applications as a networking tool, for being super complete and going beyond a great WiFi hotspot finder. In it, you can also protect your home internet and track other devices.
When installed on your device, it will scan your network and scan other devices that are connected to it, as well as their IP addresses and registered names.
In it you can access the speed test, a map with WiFi hotspots from around the world live, and the best internet provider in your city. All this available is free of charge for all current cell phone models.