AS3561 208.156.120.0/21 CIDR and IP Range Summary.ASN: 3561 - CenturyLink Communications LLCHost Count: 2046Addressable IPs: 2048208.156.120.0/24208.156.121.0/24208.156.122.0/24208.156.123.0/24208.156.124.0/24208.156.125.0/24208.156.126.0/24208.156.127.0/24