AS16509 15.221.16.0/20 CIDR and IP Range Summary.ASN: 16509 - Amazon.com Inc.Host Count: 4094Addressable IPs: 409615.221.16.0/2415.221.17.0/2415.221.18.0/2415.221.19.0/2415.221.20.0/2415.221.21.0/2415.221.22.0/2415.221.23.0/2415.221.24.0/2415.221.25.0/2415.221.26.0/2415.221.27.0/2415.221.28.0/2415.221.29.0/2415.221.30.0/2415.221.31.0/24