ipset -N myBlackhole-4 hash:net family inet ipset -N myBlackhole-6 hash:net family inet6 ipset -A myBlackhole-4 80.81.224.0/20 iptables -A INPUT -m set --match-set myBlackhole-4 src -j DROP ip6tables -A INPUT -m set --match-set myBlackhole-6 src -j DROP