netstat for android also works
https://play.google.com/store/apps/details?id=com.rinacode.android.netstatplus&hl=en
it will also show you which app is making what requests. you'll want to do this anyway - there are many stray connections by random apps. you'll probably need adaway if you want to run a host file block. host file obviously requires root, dunno if you're interested in rooting.
if you want to take it a step further, you can host redirect to local 127 0 0 1. then run a web server to respond. adaway will do advertisements here for you, like a 1x1 clear pixel for images. however, if it's expecting a response for uploading camera video, it might freeze your os until it gets a 'video received' signal, you can copy that signal and simulate it with a webserver.