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It's like the days of sa/no password all over again. Made easier because of the published CIDR blocks.

If you are not using Python, scanning large swaths of IP addresses or even the whole IPv4 space for open port 9200 is very doable.

What's the problem with Python in this situation? Concurrency and Gil locks?

I read a little fast, he didn't scan with Python, he just used Python to analyze the results. My bad.