AS3561 208.156.72.0/21 CIDR and IP Range Summary.ASN: 3561 - CenturyLink Communications LLCHost Count: 2046Addressable IPs: 2048208.156.72.0/24208.156.73.0/24208.156.74.0/24208.156.75.0/24208.156.76.0/24208.156.77.0/24208.156.78.0/24208.156.79.0/24