AS3561 216.74.168.0/21 CIDR and IP Range Summary.ASN: 3561 - CenturyLink Communications LLCHost Count: 2046Addressable IPs: 2048216.74.168.0/24216.74.169.0/24216.74.170.0/24216.74.171.0/24216.74.172.0/24216.74.173.0/24216.74.174.0/24216.74.175.0/24