AS4766 121.135.152.0/21 CIDR and IP Range Summary.ASN: 4766 - Korea TelecomHost Count: 2046Addressable IPs: 2048121.135.152.0/24121.135.153.0/24121.135.154.0/24121.135.155.0/24121.135.156.0/24121.135.157.0/24121.135.158.0/24121.135.159.0/24