AS721 138.167.168.0/21 CIDR and IP Range Summary.ASN: 721 - DoD Network Information CenterHost Count: 2046Addressable IPs: 2048138.167.168.0/24138.167.169.0/24138.167.170.0/24138.167.171.0/24138.167.172.0/24138.167.173.0/24138.167.174.0/24138.167.175.0/24