AS16509 18.68.136.0/21 CIDR and IP Range Summary.ASN: 16509 - Amazon.com Inc.Host Count: 2046Addressable IPs: 204818.68.136.0/2418.68.137.0/2418.68.138.0/2418.68.139.0/2418.68.140.0/2418.68.141.0/2418.68.142.0/2418.68.143.0/24