AS637 138.157.16.0/21 CIDR and IP Range Summary.ASN: 637 - DoD Network Information CenterHost Count: 2046Addressable IPs: 2048138.157.16.0/24138.157.17.0/24138.157.18.0/24138.157.19.0/24138.157.20.0/24138.157.21.0/24138.157.22.0/24138.157.23.0/24