Apex domains cannot have CNAME records.
Question and response
Question
dig ptsi.net. NS
Answer
ptsi.net. 4 NS ns1.ptsi.net.
ptsi.net. 4 NS ns.ptsi.net.
Authority
The response has no authority records.
Additional
ns.ptsi.net. 4 A 65.79.197.98
ns1.ptsi.net. 4 A 65.79.193.9
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0