AS721 215.1.72.0/21 CIDR and IP Range Summary.ASN: 721 - DoD Network Information CenterHost Count: 2046Addressable IPs: 2048215.1.72.0/24215.1.73.0/24215.1.74.0/24215.1.75.0/24215.1.76.0/24215.1.77.0/24215.1.78.0/24215.1.79.0/24