AS4766 121.172.152.0/21 CIDR and IP Range Summary.ASN: 4766 - Korea TelecomHost Count: 2046Addressable IPs: 2048121.172.152.0/24121.172.153.0/24121.172.154.0/24121.172.155.0/24121.172.156.0/24121.172.157.0/24121.172.158.0/24121.172.159.0/24