Apex domains cannot have CNAME records.
Question and response
Question
dig nethosting.com. NS
Answer
nethosting.com. 4 NS ns2.fiber.net.
nethosting.com. 4 NS ns4.fiber.net.
nethosting.com. 4 NS ns1.fiber.net.
nethosting.com. 4 NS ns3.fiber.net.
Authority
The response has no authority records.
Additional
ns1.fiber.net. 4 A 216.83.130.2
ns2.fiber.net. 4 A 216.83.130.7
ns3.fiber.net. 4 A 69.160.64.2
ns4.fiber.net. 4 A 69.168.67.2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0