AS721 6.51.24.0/21 CIDR and IP Range Summary.ASN: 721 - DoD Network Information CenterHost Count: 2046Addressable IPs: 20486.51.24.0/246.51.25.0/246.51.26.0/246.51.27.0/246.51.28.0/246.51.29.0/246.51.30.0/246.51.31.0/24