AS4643 61.88.240.0/21 CIDR and IP Range Summary.ASN: 4643 - Optus Customer NetworkHost Count: 2046Addressable IPs: 204861.88.240.0/2461.88.241.0/2461.88.242.0/2461.88.243.0/2461.88.244.0/2461.88.245.0/2461.88.246.0/2461.88.247.0/24