AS3561 206.154.56.0/21 CIDR and IP Range Summary.ASN: 3561 - CenturyLink Communications LLCHost Count: 2046Addressable IPs: 2048206.154.56.0/24206.154.57.0/24206.154.58.0/24206.154.59.0/24206.154.60.0/24206.154.61.0/24206.154.62.0/24206.154.63.0/24