AS3561 205.216.16.0/21 CIDR and IP Range Summary.ASN: 3561 - CenturyLink Communications LLCHost Count: 2046Addressable IPs: 2048205.216.16.0/24205.216.17.0/24205.216.18.0/24205.216.19.0/24205.216.20.0/24205.216.21.0/24205.216.22.0/24205.216.23.0/24