AS3561 64.15.168.0/21 CIDR and IP Range Summary.ASN: 3561 - CenturyLink Communications LLCHost Count: 2046Addressable IPs: 204864.15.168.0/2464.15.169.0/2464.15.170.0/2464.15.171.0/2464.15.172.0/2464.15.173.0/2464.15.174.0/2464.15.175.0/24