AS4643 202.139.48.0/21 CIDR and IP Range Summary.ASN: 4643 - Optus Customer NetworkHost Count: 2046Addressable IPs: 2048202.139.48.0/24202.139.49.0/24202.139.50.0/24202.139.51.0/24202.139.52.0/24202.139.53.0/24202.139.54.0/24202.139.55.0/24