AS4643 203.202.8.0/21 CIDR and IP Range Summary.ASN: 4643 - Optus Customer NetworkHost Count: 2046Addressable IPs: 2048203.202.8.0/24203.202.9.0/24203.202.10.0/24203.202.11.0/24203.202.12.0/24203.202.13.0/24203.202.14.0/24203.202.15.0/24