AS4766 121.178.216.0/21 CIDR and IP Range Summary.ASN: 4766 - Korea TelecomHost Count: 2046Addressable IPs: 2048121.178.216.0/24121.178.217.0/24121.178.218.0/24121.178.219.0/24121.178.220.0/24121.178.221.0/24121.178.222.0/24121.178.223.0/24