AS3561 206.156.248.0/21 CIDR and IP Range Summary.ASN: 3561 - CenturyLink Communications LLCHost Count: 2046Addressable IPs: 2048206.156.248.0/24206.156.249.0/24206.156.250.0/24206.156.251.0/24206.156.252.0/24206.156.253.0/24206.156.254.0/24206.156.255.0/24