Apex domains cannot have CNAME records.
Question and response
Question
dig rockynet.com. NS
Answer
rockynet.com. 5 NS ns3.massivenetworks.net.
rockynet.com. 5 NS ns1.massivenetworks.net.
rockynet.com. 5 NS ns2.massivenetworks.net.
Authority
The response has no authority records.
Additional
ns1.massivenetworks.net. 5 A 199.127.201.2
ns2.massivenetworks.net. 5 A 207.174.110.13
ns3.massivenetworks.net. 5 A 199.189.30.36
ns1.massivenetworks.net. 5 AAAA 2602:ffc6:220:100:0:0:0:2
ns2.massivenetworks.net. 5 AAAA 2602:ffc6:400:aa:0:0:0:13
ns3.massivenetworks.net. 5 AAAA 2602:ffc6:100:ab:0:0:0:36
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0