Probably don't share much then do ya? You gonna port scan the whole world with that from your home computer? That ought not take too long.. or attract any attention really. have a go at it! Ask it to scan from 18.104.22.168 to 255.255.255.255
Angry IP Scanner is one of those tools you can get yourself into a lot of trouble with. Either your ISP or even the ISP at the other end could be set up to alert on network scans. So when you decide to knock on every door on a subnet you best well protected or you could get the internet police coming down heavy. Good luck bro. Shodan gets away with it either because they dont care or they have a legitimate purpose - and that purpose is not being a peeping tom.
You guys seem legit knowledgeable. Myself I'm more of a stash a cam & wait sorta guy but reading the op and 2 replys here's the first thing that came to mind. What if op went somewhere with free internet and tried this. Hell even Walmart has it and u don't even have to get out of your car. Now I'm sure you couldn't do it for hours at a time without drawing too much attention but drive down the street & find another store lol. Like I said, ip shit and webcam stuff sounds interesting but that's not My knowledge field