Apex domains cannot have CNAME records.
Question and response
Question
dig 148.236.205.in-addr.arpa. NS
Answer
148.236.205.in-addr.arpa. 5 NS galilee1.sogetel.net.
148.236.205.in-addr.arpa. 5 NS galilee2.sogetel.net.
Authority
The response has no authority records.
Additional
galilee1.sogetel.net. 5 A 205.236.148.130
galilee2.sogetel.net. 5 A 205.236.148.131
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0