AS721 55.91.168.0/21 CIDR and IP Range Summary.ASN: 721 - DoD Network Information CenterHost Count: 2046Addressable IPs: 204855.91.168.0/2455.91.169.0/2455.91.170.0/2455.91.171.0/2455.91.172.0/2455.91.173.0/2455.91.174.0/2455.91.175.0/24