AS7474 203.6.16.0/21 CIDR and IP Range Summary.ASN: 7474 - SingTel Optus Pty LtdHost Count: 2046Addressable IPs: 2048203.6.16.0/24203.6.17.0/24203.6.18.0/24203.6.19.0/24203.6.20.0/24203.6.21.0/24203.6.22.0/24203.6.23.0/24