It's possible to check every IP on the Internet nowadays so you don't need to keep a list. You can just brute-force check every IPv4 address in less than an hou

It's possible to check every IP on the Internet nowadays so you don't need to keep a list. You can just brute-force check every IPv4 address in less than an hour. I've written on the subject a few times: https://blog.shodan.io/its-the-data-stupid/ https://blog.shodan.io/its-the-data-stupid/