AS4766 221.159.216.0/21 CIDR and IP Range Summary.ASN: 4766 - Korea TelecomHost Count: 2046Addressable IPs: 2048221.159.216.0/24221.159.217.0/24221.159.218.0/24221.159.219.0/24221.159.220.0/24221.159.221.0/24221.159.222.0/24221.159.223.0/24