AS16509 18.173.0.0/21 CIDR and IP Range Summary.ASN: 16509 - Amazon.com Inc.Host Count: 2046Addressable IPs: 204818.173.0.0/2418.173.1.0/2418.173.2.0/2418.173.3.0/2418.173.4.0/2418.173.5.0/2418.173.6.0/2418.173.7.0/24