AS3561 66.100.216.0/21 CIDR and IP Range Summary.ASN: 3561 - CenturyLink Communications LLCHost Count: 2046Addressable IPs: 204866.100.216.0/2466.100.217.0/2466.100.218.0/2466.100.219.0/2466.100.220.0/2466.100.221.0/2466.100.222.0/2466.100.223.0/24