AS4643 203.16.112.0/20 CIDR and IP Range Summary.ASN: 4643 - Optus Customer NetworkHost Count: 4094Addressable IPs: 4096203.16.112.0/24203.16.113.0/24203.16.114.0/24203.16.115.0/24203.16.116.0/24203.16.117.0/24203.16.118.0/24203.16.119.0/24203.16.120.0/24203.16.121.0/24203.16.122.0/24203.16.123.0/24203.16.124.0/24203.16.125.0/24203.16.126.0/24203.16.127.0/24