AS4766 121.172.128.0/20 CIDR and IP Range Summary.ASN: 4766 - Korea TelecomHost Count: 4094Addressable IPs: 4096121.172.128.0/24121.172.129.0/24121.172.130.0/24121.172.131.0/24121.172.132.0/24121.172.133.0/24121.172.134.0/24121.172.135.0/24121.172.136.0/24121.172.137.0/24121.172.138.0/24121.172.139.0/24121.172.140.0/24121.172.141.0/24121.172.142.0/24121.172.143.0/24