AS16509 3.163.16.0/21 CIDR and IP Range Summary.ASN: 16509 - Amazon.com Inc.Host Count: 2046Addressable IPs: 20483.163.16.0/243.163.17.0/243.163.18.0/243.163.19.0/243.163.20.0/243.163.21.0/243.163.22.0/243.163.23.0/24