AS16509 18.173.56.0/21 CIDR and IP Range Summary.ASN: 16509 - Amazon.com Inc.Host Count: 2046Addressable IPs: 204818.173.56.0/2418.173.57.0/2418.173.58.0/2418.173.59.0/2418.173.60.0/2418.173.61.0/2418.173.62.0/2418.173.63.0/24