Who Me Too'd this topic

Hi I recently got many amazonaws.com IPs listed in my attacker list from my daily report as below. How do I block all traffic from amazonaws, and I cannot find it from my traffic monitor and why? Please give me some hints?

52.5.42.249 ec2-52-5-42-249.compute-1.amazonaws.com 10
54.85.146.141 ec2-54-85-146-141.compute-1.amazonaws.com 9
52.91.113.81 ec2-52-91-113-81.compute-1.amazonaws.com 6
52.4.179.243 ec2-52-4-179-243.compute-1.amazonaws.com 5
52.21.173.164 ec2-52-21-173-164.compute-1.amazonaws.com 5
54.84.95.2 ec2-54-84-95-2.compute-1.amazonaws.com 5
52.5.15.19 ec2-52-5-15-19.compute-1.amazonaws.com 4
54.208.13.33 ec2-54-208-13-33.compute-1.amazonaws.com 4