AS4766 61.72.136.0/21 CIDR and IP Range Summary.ASN: 4766 - Korea TelecomHost Count: 2046Addressable IPs: 204861.72.136.0/2461.72.137.0/2461.72.138.0/2461.72.139.0/2461.72.140.0/2461.72.141.0/2461.72.142.0/2461.72.143.0/24