Apex domains cannot have CNAME records.
Question and response
Question
dig mysrsx.com. NS
Answer
mysrsx.com. 5 NS nsrw4.mysrsx.com.
mysrsx.com. 5 NS nsrw1.mysrsx.org.
mysrsx.com. 5 NS nsrw2.mysrsx.biz.
mysrsx.com. 5 NS nsrw3.mysrsx.net.
Authority
The response has no authority records.
Additional
nsrw4.mysrsx.com. 5 A 185.136.99.88
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0