mail.yht.jp has no NS records.
NS records for this zone are defined at yht.jp.
NS records for this zone are defined at yht.jp.
Question and response
Question
dig mail.yht.jp. NS
Answer
The response has no answer records.
Authority
yht.jp. 300 SOA ns1.hs.ctc.jp. postmaster.yht.jp. 2024091200 28800 7200 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0