AS4643 203.110.248.0/21 CIDR and IP Range Summary.ASN: 4643 - Optus Customer NetworkHost Count: 2046Addressable IPs: 2048203.110.248.0/24203.110.249.0/24203.110.250.0/24203.110.251.0/24203.110.252.0/24203.110.253.0/24203.110.254.0/24203.110.255.0/24