AS3561 216.136.168.0/21 CIDR and IP Range Summary.ASN: 3561 - CenturyLink Communications LLCHost Count: 2046Addressable IPs: 2048216.136.168.0/24216.136.169.0/24216.136.170.0/24216.136.171.0/24216.136.172.0/24216.136.173.0/24216.136.174.0/24216.136.175.0/24