AS3561 208.137.16.0/20 CIDR and IP Range Summary.ASN: 3561 - CenturyLink Communications LLCHost Count: 4094Addressable IPs: 4096208.137.16.0/24208.137.17.0/24208.137.18.0/24208.137.19.0/24208.137.20.0/24208.137.21.0/24208.137.22.0/24208.137.23.0/24208.137.24.0/24208.137.25.0/24208.137.26.0/24208.137.27.0/24208.137.28.0/24208.137.29.0/24208.137.30.0/24208.137.31.0/24