AS721 138.157.192.0/21 CIDR and IP Range Summary.ASN: 721 - DoD Network Information CenterHost Count: 2046Addressable IPs: 2048138.157.192.0/24138.157.193.0/24138.157.194.0/24138.157.195.0/24138.157.196.0/24138.157.197.0/24138.157.198.0/24138.157.199.0/24