ctlg.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 ctlg.yht.jp. NS
Answer
The response has no answer records.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0