ns.miraedns.com.name7.com has no CNAME records.
Question and response
Question
dig ns.miraedns.com.name7.com. NS
Answer
The response has no answer records.
Authority
name7.com. 1800 SOA ns.gabia.co.kr. hosting.gabia.com. 2011082514 1800 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0