moa1820.msg.2iij.net has no CNAME records.
Question and response
Question
dig moa1820.msg.2iij.net. NS
Answer
The response has no answer records.
Authority
msg.2iij.net. 2240 SOA dns0.iij.ad.jp. postmaster.iij.ad.jp. 100545 3600 1800 3600000 36000
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0