AS16509 18.173.40.0/21 CIDR and IP Range Summary.ASN: 16509 - Amazon.com Inc.Host Count: 2046Addressable IPs: 204818.173.40.0/2418.173.41.0/2418.173.42.0/2418.173.43.0/2418.173.44.0/2418.173.45.0/2418.173.46.0/2418.173.47.0/24