AS4643 203.16.96.0/21 CIDR and IP Range Summary.ASN: 4643 - Optus Customer NetworkHost Count: 2046Addressable IPs: 2048203.16.96.0/24203.16.97.0/24203.16.98.0/24203.16.99.0/24203.16.100.0/24203.16.101.0/24203.16.102.0/24203.16.103.0/24