AS4643 203.202.16.0/20 CIDR and IP Range Summary.ASN: 4643 - Optus Customer NetworkHost Count: 4094Addressable IPs: 4096203.202.16.0/24203.202.17.0/24203.202.18.0/24203.202.19.0/24203.202.20.0/24203.202.21.0/24203.202.22.0/24203.202.23.0/24203.202.24.0/24203.202.25.0/24203.202.26.0/24203.202.27.0/24203.202.28.0/24203.202.29.0/24203.202.30.0/24203.202.31.0/24