AS4766 221.165.16.0/21 CIDR and IP Range Summary.ASN: 4766 - Korea TelecomHost Count: 2046Addressable IPs: 2048221.165.16.0/24221.165.17.0/24221.165.18.0/24221.165.19.0/24221.165.20.0/24221.165.21.0/24221.165.22.0/24221.165.23.0/24