mailgw2.oneoffice.jp has no NS records.
NS records for this zone are defined at oneoffice.jp.
NS records for this zone are defined at oneoffice.jp.
Question and response
Question
dig mailgw2.oneoffice.jp. NS
Answer
The response has no answer records.
Authority
oneoffice.jp. 900 SOA dns1.broadline.ne.jp. dns-info.broadline.ne.jp. 671 10800 900 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0