AS3561 204.188.40.0/21 CIDR and IP Range Summary.ASN: 3561 - CenturyLink Communications LLCHost Count: 2046Addressable IPs: 2048204.188.40.0/24204.188.41.0/24204.188.42.0/24204.188.43.0/24204.188.44.0/24204.188.45.0/24204.188.46.0/24204.188.47.0/24