AS3561 199.242.16.0/21 CIDR and IP Range Summary.ASN: 3561 - CenturyLink Communications LLCHost Count: 2046Addressable IPs: 2048199.242.16.0/24199.242.17.0/24199.242.18.0/24199.242.19.0/24199.242.20.0/24199.242.21.0/24199.242.22.0/24199.242.23.0/24