AS721 199.251.144.0/21 CIDR and IP Range Summary.ASN: 721 - DoD Network Information CenterHost Count: 2046Addressable IPs: 2048199.251.144.0/24199.251.145.0/24199.251.146.0/24199.251.147.0/24199.251.148.0/24199.251.149.0/24199.251.150.0/24199.251.151.0/24