Apex domains cannot have CNAME records.
Question and response
Question
dig ipptr.com. NS
Answer
ipptr.com. 5 NS ns1.ipptr.com.
Authority
The response has no authority records.
Additional
ns1.ipptr.com. 5 A 103.16.100.14
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0