AS721 143.81.144.0/21 CIDR and IP Range Summary.ASN: 721 - DoD Network Information CenterHost Count: 2046Addressable IPs: 2048143.81.144.0/24143.81.145.0/24143.81.146.0/24143.81.147.0/24143.81.148.0/24143.81.149.0/24143.81.150.0/24143.81.151.0/24