AS4766 121.163.160.0/21 CIDR and IP Range Summary.ASN: 4766 - Korea TelecomHost Count: 2046Addressable IPs: 2048121.163.160.0/24121.163.161.0/24121.163.162.0/24121.163.163.0/24121.163.164.0/24121.163.165.0/24121.163.166.0/24121.163.167.0/24