AS3561 206.153.216.0/21 CIDR and IP Range Summary.ASN: 3561 - CenturyLink Communications LLCHost Count: 2046Addressable IPs: 2048206.153.216.0/24206.153.217.0/24206.153.218.0/24206.153.219.0/24206.153.220.0/24206.153.221.0/24206.153.222.0/24206.153.223.0/24