Apex domains cannot have CNAME records.
Question and response
Question
dig gansend.com. NS
Answer
gansend.com. 5 NS ns1.mainloop.net.
gansend.com. 5 NS ns4.mainloop.net.
gansend.com. 5 NS ns3.mainloop.net.
gansend.com. 5 NS ns2.mainloop.net.
Authority
The response has no authority records.
Additional
ns1.mainloop.net. 5 A 185.84.240.10
ns2.mainloop.net. 5 A 185.136.97.111
ns3.mainloop.net. 5 A 185.84.240.11
ns4.mainloop.net. 5 A 185.136.96.111
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0