mx.aams4.jp has no NS records.
NS records for this zone are defined at aams4.jp.
NS records for this zone are defined at aams4.jp.
Question and response
Question
dig mx.aams4.jp. NS
Answer
The response has no answer records.
Authority
aams4.jp. 300 SOA www1.aams.jp. aams-support.bbsec.co.jp. 2025040401 300 60 604800 300
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0