Another case: #Airbnb guest found hidden #surveillance camera by scanning Wi-Fi network. The most troubling part of this is the reaction from Airbnb. They didn’t do anything until it became public and a PR issue. That is just shady.
Fing is an app to scan networks quickly: https://play.google.com/store/apps/details?id=com.overlook.android.fing
Open-source developer, mostly working on smaller projects.