AS4766 121.163.240.0/21 CIDR and IP Range Summary.ASN: 4766 - Korea TelecomHost Count: 2046Addressable IPs: 2048121.163.240.0/24121.163.241.0/24121.163.242.0/24121.163.243.0/24121.163.244.0/24121.163.245.0/24121.163.246.0/24121.163.247.0/24