AS3561 208.153.144.0/21 CIDR and IP Range Summary.ASN: 3561 - CenturyLink Communications LLCHost Count: 2046Addressable IPs: 2048208.153.144.0/24208.153.145.0/24208.153.146.0/24208.153.147.0/24208.153.148.0/24208.153.149.0/24208.153.150.0/24208.153.151.0/24