AS3561 206.156.56.0/21 CIDR and IP Range Summary.ASN: 3561 - CenturyLink Communications LLCHost Count: 2046Addressable IPs: 2048206.156.56.0/24206.156.57.0/24206.156.58.0/24206.156.59.0/24206.156.60.0/24206.156.61.0/24206.156.62.0/24206.156.63.0/24