AS3561 206.31.56.0/21 CIDR and IP Range Summary.ASN: 3561 - CenturyLink Communications LLCHost Count: 2046Addressable IPs: 2048206.31.56.0/24206.31.57.0/24206.31.58.0/24206.31.59.0/24206.31.60.0/24206.31.61.0/24206.31.62.0/24206.31.63.0/24