ftp.korehosting.net has no CNAME records.
Question and response
Question
dig ftp.korehosting.net. NS
Answer
The response has no answer records.
Authority
korehosting.net. 5810 SOA ns3.korehosting.net. koree.koree.net. 2026011504 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0