AS721 143.81.208.0/21 CIDR and IP Range Summary.ASN: 721 - DoD Network Information CenterHost Count: 2046Addressable IPs: 2048143.81.208.0/24143.81.209.0/24143.81.210.0/24143.81.211.0/24143.81.212.0/24143.81.213.0/24143.81.214.0/24143.81.215.0/24