AS3561 216.91.16.0/20 CIDR and IP Range Summary.ASN: 3561 - CenturyLink Communications LLCHost Count: 4094Addressable IPs: 4096216.91.16.0/24216.91.17.0/24216.91.18.0/24216.91.19.0/24216.91.20.0/24216.91.21.0/24216.91.22.0/24216.91.23.0/24216.91.24.0/24216.91.25.0/24216.91.26.0/24216.91.27.0/24216.91.28.0/24216.91.29.0/24216.91.30.0/24216.91.31.0/24