Apex domains cannot have CNAME records.
Question and response
Question
dig seaservers.net. NS
Answer
seaservers.net. 4 NS ns2.hwrn.net.
seaservers.net. 4 NS ns1.hwrn.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0