AS721 55.91.128.0/21 CIDR and IP Range Summary.ASN: 721 - DoD Network Information CenterHost Count: 2046Addressable IPs: 204855.91.128.0/2455.91.129.0/2455.91.130.0/2455.91.131.0/2455.91.132.0/2455.91.133.0/2455.91.134.0/2455.91.135.0/24