AS4766 221.165.128.0/21 CIDR and IP Range Summary.ASN: 4766 - Korea TelecomHost Count: 2046Addressable IPs: 2048221.165.128.0/24221.165.129.0/24221.165.130.0/24221.165.131.0/24221.165.132.0/24221.165.133.0/24221.165.134.0/24221.165.135.0/24