Apex domains cannot have CNAME records.
Question and response
Question
dig iplanet.ec. NS
Answer
iplanet.ec. 5 NS ns3.iplanet.ec.
iplanet.ec. 5 NS ns2.fibramax.ec.
iplanet.ec. 5 NS ns1.fibramax.ec.
iplanet.ec. 5 NS ns4.iplanet.ec.
Authority
The response has no authority records.
Additional
ns1.fibramax.ec. 5 A 200.63.106.194
ns2.fibramax.ec. 5 A 200.63.106.194
ns3.iplanet.ec. 5 A 200.63.106.194
ns4.iplanet.ec. 5 A 200.63.106.194
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0