AS4643 202.139.88.0/21 CIDR and IP Range Summary.ASN: 4643 - Optus Customer NetworkHost Count: 2046Addressable IPs: 2048202.139.88.0/24202.139.89.0/24202.139.90.0/24202.139.91.0/24202.139.92.0/24202.139.93.0/24202.139.94.0/24202.139.95.0/24