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@ryanc I trust it that you personally considered everything with your own IP parsing library but really: this is bad general advise. The trouble starts when your library processes that “cursed inet_aton nonsense” and passes it on to something that actually uses inet_aton or similar logic. And then your security checks are no longer valid because what you considered a DNS-resolvable host name is treated as an IP address further along the line, or what you considered decimal numbers is treated as octal. I’ve seen vulnerabilities due to such parser mismatches and avoiding them is very tricky.