AS16509 18.238.168.0/21 CIDR and IP Range Summary.ASN: 16509 - Amazon.com Inc.Host Count: 2046Addressable IPs: 204818.238.168.0/2418.238.169.0/2418.238.170.0/2418.238.171.0/2418.238.172.0/2418.238.173.0/2418.238.174.0/2418.238.175.0/24