AS4643 203.13.104.0/21 CIDR and IP Range Summary.ASN: 4643 - Optus Customer NetworkHost Count: 2046Addressable IPs: 2048203.13.104.0/24203.13.105.0/24203.13.106.0/24203.13.107.0/24203.13.108.0/24203.13.109.0/24203.13.110.0/24203.13.111.0/24