AS721 205.57.56.0/21 CIDR and IP Range Summary.ASN: 721 - DoD Network Information CenterHost Count: 2046Addressable IPs: 2048205.57.56.0/24205.57.57.0/24205.57.58.0/24205.57.59.0/24205.57.60.0/24205.57.61.0/24205.57.62.0/24205.57.63.0/24