AS721 205.58.136.0/21 CIDR and IP Range Summary.ASN: 721 - DoD Network Information CenterHost Count: 2046Addressable IPs: 2048205.58.136.0/24205.58.137.0/24205.58.138.0/24205.58.139.0/24205.58.140.0/24205.58.141.0/24205.58.142.0/24205.58.143.0/24