this post was submitted on 05 Jan 2024
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There is also the DNS system itself, not sure if reverse lookup is possible in some way without a PTR record, but suffice to say there are ways, and there are many.
Obscurity is not security, just a reasonable first line of defense. If you run something publicly accessible, lock it down.
Stuff that can't be brute forced in a million years is a good way to do that, even if it's just a string in a URL. It's basically like having to enter a password. You could even fail2ban it by banning IPs that try a bunch of random URLs that aren't valid, or use a simple rate-limit.