AS4766 121.157.152.0/21 CIDR and IP Range Summary.ASN: 4766 - Korea TelecomHost Count: 2046Addressable IPs: 2048121.157.152.0/24121.157.153.0/24121.157.154.0/24121.157.155.0/24121.157.156.0/24121.157.157.0/24121.157.158.0/24121.157.159.0/24