I'm not sure about the article, but the blazingly-fast IP scanner sounds a lot like Masscan: <a href="https://github.com/robertdavidgraham/masscan">https://github.com/robertdavidgraham/masscan</a><p>It can scan the entire Internet in 5 minutes and has received a lot of press. <a href="https://rushter.com/blog/how-masscan-works/" rel="nofollow">https://rushter.com/blog/how-masscan-works/</a> is one of many articles about how it works.