AS721 155.20.0.0/21 CIDR and IP Range Summary.ASN: 721 - DoD Network Information CenterHost Count: 2046Addressable IPs: 2048155.20.0.0/24155.20.1.0/24155.20.2.0/24155.20.3.0/24155.20.4.0/24155.20.5.0/24155.20.6.0/24155.20.7.0/24