rx7.mazda.co.jp has no CNAME records.
Question and response
Question
dig rx7.mazda.co.jp. NS
Answer
The response has no answer records.
Authority
mazda.co.jp. 1800 SOA rx7.mazda.co.jp. webmaster.is.mazda.co.jp. 2026030201 300 100 1814400 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0