mds3370mx.maildealer.jp has no NS records.
NS records for this zone are defined at maildealer.jp.
NS records for this zone are defined at maildealer.jp.
Question and response
Question
dig mds3370mx.maildealer.jp. NS
Answer
The response has no answer records.
Authority
maildealer.jp. 600 SOA ns-1672.awsdns-17.co.uk. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0