AS16509 3.163.240.0/21 CIDR and IP Range Summary.ASN: 16509 - Amazon.com Inc.Host Count: 2046Addressable IPs: 20483.163.240.0/243.163.241.0/243.163.242.0/243.163.243.0/243.163.244.0/243.163.245.0/243.163.246.0/243.163.247.0/24