iptables -A INPUT -s 192.100.165.0/24 -j DROP
iptables -A INPUT -s 192.10.0.0/16 -j DROP
iptables -A INPUT -s 192.0.0.0/8 -j DROP
iptables block ranges
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iptables -A INPUT -s 192.100.165.0/24 -j DROP
iptables -A INPUT -s 192.10.0.0/16 -j DROP
iptables -A INPUT -s 192.0.0.0/8 -j DROP