smtp2.unics.ricoh.com has no NS records.
NS records for this zone are defined at unics.ricoh.com.
NS records for this zone are defined at unics.ricoh.com.
Question and response
Question
dig smtp2.unics.ricoh.com. NS
Answer
The response has no answer records.
Authority
unics.ricoh.com. 3600 SOA ns1.jp.ricoh.com. postmaster.ns1.jp.ricoh.com. 2021062500 3600 900 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0