AS3561 206.31.248.0/21 CIDR and IP Range Summary.ASN: 3561 - CenturyLink Communications LLCHost Count: 2046Addressable IPs: 2048206.31.248.0/24206.31.249.0/24206.31.250.0/24206.31.251.0/24206.31.252.0/24206.31.253.0/24206.31.254.0/24206.31.255.0/24