AS4766 221.147.56.0/21 CIDR and IP Range Summary.ASN: 4766 - Korea TelecomHost Count: 2046Addressable IPs: 2048221.147.56.0/24221.147.57.0/24221.147.58.0/24221.147.59.0/24221.147.60.0/24221.147.61.0/24221.147.62.0/24221.147.63.0/24