AS3561 206.103.72.0/21 CIDR and IP Range Summary.ASN: 3561 - CenturyLink Communications LLCHost Count: 2046Addressable IPs: 2048206.103.72.0/24206.103.73.0/24206.103.74.0/24206.103.75.0/24206.103.76.0/24206.103.77.0/24206.103.78.0/24206.103.79.0/24