AS3561 63.137.64.0/21 CIDR and IP Range Summary.ASN: 3561 - CenturyLink Communications LLCHost Count: 2046Addressable IPs: 204863.137.64.0/2463.137.65.0/2463.137.66.0/2463.137.67.0/2463.137.68.0/2463.137.69.0/2463.137.70.0/2463.137.71.0/24