AS721 143.147.248.0/21 CIDR and IP Range Summary.ASN: 721 - DoD Network Information CenterHost Count: 2046Addressable IPs: 2048143.147.248.0/24143.147.249.0/24143.147.250.0/24143.147.251.0/24143.147.252.0/24143.147.253.0/24143.147.254.0/24143.147.255.0/24