AS3561 206.40.136.0/21 CIDR and IP Range Summary.ASN: 3561 - CenturyLink Communications LLCHost Count: 2046Addressable IPs: 2048206.40.136.0/24206.40.137.0/24206.40.138.0/24206.40.139.0/24206.40.140.0/24206.40.141.0/24206.40.142.0/24206.40.143.0/24