AS16509 18.173.240.0/21 CIDR and IP Range Summary.ASN: 16509 - Amazon.com Inc.Host Count: 2046Addressable IPs: 204818.173.240.0/2418.173.241.0/2418.173.242.0/2418.173.243.0/2418.173.244.0/2418.173.245.0/2418.173.246.0/2418.173.247.0/24