Apex domains cannot have CNAME records.
Question and response
Question
dig red.rockhoster.in. NS
Answer
red.rockhoster.in. 5 NS ns1.18-157-218-83.cprapid.com.
red.rockhoster.in. 5 NS ns2.18-157-218-83.cprapid.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0