AS3561 206.156.40.0/21 CIDR and IP Range Summary.ASN: 3561 - CenturyLink Communications LLCHost Count: 2046Addressable IPs: 2048206.156.40.0/24206.156.41.0/24206.156.42.0/24206.156.43.0/24206.156.44.0/24206.156.45.0/24206.156.46.0/24206.156.47.0/24