Apex domains cannot have CNAME records.
Question and response
Question
dig 128.142.178.203.in-addr.arpa. NS
Answer
128.142.178.203.in-addr.arpa. 4 NS ns.sfc.wide.ad.jp.
Authority
The response has no authority records.
Additional
ns.sfc.wide.ad.jp. 4 A 203.178.142.143
ns.sfc.wide.ad.jp. 4 AAAA 2001:200:0:8803:203:178:142:143
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0