AS4637 138.104.0.0/21 CIDR and IP Range Summary.ASN: 4637 - Telstra GlobalHost Count: 2046Addressable IPs: 2048138.104.0.0/24138.104.1.0/24138.104.2.0/24138.104.3.0/24138.104.4.0/24138.104.5.0/24138.104.6.0/24138.104.7.0/24