AS721 205.100.16.0/21 CIDR and IP Range Summary.ASN: 721 - DoD Network Information CenterHost Count: 2046Addressable IPs: 2048205.100.16.0/24205.100.17.0/24205.100.18.0/24205.100.19.0/24205.100.20.0/24205.100.21.0/24205.100.22.0/24205.100.23.0/24