oim01.eng.bbtower.co.jp has no CNAME records.
Question and response
Question
dig oim01.eng.bbtower.co.jp. NS
Answer
The response has no answer records.
Authority
bbtower.co.jp. 900 SOA pdns10.bbtower.ne.jp. noc.bbtower.ad.jp. 2026030601 3600 1200 3600000 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0