AS4643 203.13.112.0/21 CIDR and IP Range Summary.ASN: 4643 - Optus Customer NetworkHost Count: 2046Addressable IPs: 2048203.13.112.0/24203.13.113.0/24203.13.114.0/24203.13.115.0/24203.13.116.0/24203.13.117.0/24203.13.118.0/24203.13.119.0/24