Good point. fail2ban isn't exactly the right tool for this.
There appears to be a project but I don't
think it's maintained:Â
<https://github.com/XaF/fail2ban-subnets>https://github.com/XaF/fail2ban-subnets
Take a look at this project:
https://github.com/dpsystems/login-shield
It's meant as an enhancement to f2b, implementing
an IP subset-based blacklist of specific areas
that are notorious for being sources of server
attacks. It's stopped 98% of my attacks.
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