AS16509 18.238.144.0/21 CIDR and IP Range Summary.ASN: 16509 - Amazon.com Inc.Host Count: 2046Addressable IPs: 204818.238.144.0/2418.238.145.0/2418.238.146.0/2418.238.147.0/2418.238.148.0/2418.238.149.0/2418.238.150.0/2418.238.151.0/24