AS721 138.157.24.0/21 CIDR and IP Range Summary.ASN: 721 - DoD Network Information CenterHost Count: 2046Addressable IPs: 2048138.157.24.0/24138.157.25.0/24138.157.26.0/24138.157.27.0/24138.157.28.0/24138.157.29.0/24138.157.30.0/24138.157.31.0/24