ipset -N myBlackhole-4 hash:net family inet
ipset -N myBlackhole-6 hash:net family inet6
ipset -A myBlackhole-4 31.24.128.0/21
ipset -A myBlackhole-4 178.21.128.0/21
ipset -A myBlackhole-4 81.27.32.0/20
ipset -A myBlackhole-6 2a00:1c90::/32
iptables -A INPUT -m set --match-set myBlackhole-4 src -j DROP
ip6tables -A INPUT -m set --match-set myBlackhole-6 src -j DROP