In your nginx, server section: deny 1.2.3.0/24; And all 256 ips from 1.2.3.0 to 1.2.3.255 get banned. You can have multiple "deny" lines, or a file with "

In your nginx, server section: deny 1.2.3.0/24; And all 256 ips from 1.2.3.0 to 1.2.3.255 get banned. You can have multiple "deny" lines, or a file with "deny" and then include it. It's better to do it at the firewall.