obs.alpha-web.jp has no CNAME records.
Question and response
Question
dig obs.alpha-web.jp. NS
Answer
The response has no answer records.
Authority
alpha-web.jp. 3276 SOA kotetsu.alpha-lt.net. postmaster.alpha-web.ne.jp. 2025091710 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0