mx.mitene.jp has no NS records.
NS records for this zone are defined at mitene.jp.
NS records for this zone are defined at mitene.jp.
Question and response
Question
dig mx.mitene.jp. NS
Answer
The response has no answer records.
Authority
mitene.jp. 600 SOA nsx1.mitene.ad.jp. postmaster.po.mitene.or.jp. 101125 7200 1800 1209600 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0