radf3.mind.ne.jp has no CNAME records.
Question and response
Question
dig radf3.mind.ne.jp. NS
Answer
The response has no answer records.
Authority
mind.ne.jp. 787 SOA ns.mind.ad.jp. hostmaster.mind.ad.jp. 3000000202 10800 3600 2419200 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0