mtaoci02.cybermail.jp has no NS records.
NS records for this zone are defined at cybermail.jp.
NS records for this zone are defined at cybermail.jp.
Question and response
Question
dig mtaoci02.cybermail.jp. NS
Answer
The response has no answer records.
Authority
cybermail.jp. 300 SOA ns1.p202.dns.oraclecloud.net. hostmaster.cybermail.jp. 357 3600 600 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0