AS3561 216.64.216.0/21 CIDR and IP Range Summary.ASN: 3561 - CenturyLink Communications LLCHost Count: 2046Addressable IPs: 2048216.64.216.0/24216.64.217.0/24216.64.218.0/24216.64.219.0/24216.64.220.0/24216.64.221.0/24216.64.222.0/24216.64.223.0/24