iptables -I INPUT -s 42.0.0.0/8 -j DROP
iptables -I INPUT -s 46.229.0.0/16 -j DROP
service iptables save
service iptables restart

http://blog.sina.com.cn/s/blog_7358b9e90102y7ym.html
https://www.cnblogs.com/yxjs/p/9530752.html