amazon EC2 ゾーンリスト＠DDoS対策

wget -qO - https://forums.aws.amazon.com/ann.jspa?annID=1701 | grep -Eoh "[0-9.]+{4}/[0-9]+" 

http://maxbeatty.com/blog/2012/06/finding-amazon-s3-region-ip-ranges/