ns1.jp.ricoh.com has no CNAME records.
Question and response
Question
dig ns1.jp.ricoh.com. NS
Answer
The response has no answer records.
Authority
jp.ricoh.com. 900 SOA ns1.jp.ricoh.com. postmaster.ns1.jp.ricoh.com. 2026030904 10800 3600 2419200 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0