scanning for proxies

so i just started looking into 0.0.0.0/0 scanning and it has shown a lot of potential so far with application like zmap and zgrab, had a lot of fun joining random minecraft server, but i would like to explore a more practical, usefull you might say, approach. when i think of scanning the internet other than vulnerable DNS servers, i think about those looooong ass free proxy lists sitting there in the open. I know, i know those are not anonymous, but i was wondering, how the duck do they get those lists, they are obviously not their servers, and to add to that proxies often have random ports, how do you scan for a service that has random ports, even then if you find a server with a port 80 or 8080 it could just be an http server out there, how do you identify it is an actual proxy, banner perhaps?

ps: pls do not point out proprietary software or any if you can, i'm trying to learn here not skid, if you have a good open source project i will gladly look into it but only has a last resort

(TL;DR) i want a free proxy list, made by me, and im struggling, pls help

submitted by /u/filippobob
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from hacking: security in practice https://ift.tt/32DoJnY

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