AS3561 208.136.120.0/21 CIDR and IP Range Summary.ASN: 3561 - CenturyLink Communications LLCHost Count: 2046Addressable IPs: 2048208.136.120.0/24208.136.121.0/24208.136.122.0/24208.136.123.0/24208.136.124.0/24208.136.125.0/24208.136.126.0/24208.136.127.0/24