iptables -A INPUT -s 103.81.60.0/23 -j DROP
iptables -A INPUT -s 103.81.60.0/22 -j DROP
iptables -A INPUT -s 103.81.63.0/24 -j DROP
iptables -A INPUT -s 103.81.61.0/24 -j DROP
iptables -A INPUT -s 103.81.62.0/23 -j DROP
iptables -A INPUT -s 103.81.62.0/24 -j DROP
iptables -A INPUT -s 103.81.60.0/24 -j DROP