Apex domains cannot have CNAME records.
Question and response
Question
dig gdlicanet.net.mx. NS
Answer
gdlicanet.net.mx. 2 NS ns1.gdlicanet.net.mx.
gdlicanet.net.mx. 2 NS ns2.gdlicanet.net.mx.
gdlicanet.net.mx. 2 NS ns4.gdlicanet.net.mx.
gdlicanet.net.mx. 2 NS ns3.gdlicanet.net.mx.
gdlicanet.net.mx. 2 NS ns5.gdlicanet.net.mx.
Authority
The response has no authority records.
Additional
ns1.gdlicanet.net.mx. 2 A 167.249.252.2
ns2.gdlicanet.net.mx. 2 A 167.249.252.3
ns3.gdlicanet.net.mx. 2 A 38.122.16.134
ns4.gdlicanet.net.mx. 2 A 54.175.182.151
ns5.gdlicanet.net.mx. 2 A 209.170.67.10
ns1.gdlicanet.net.mx. 2 AAAA 2806:20f:0:0:0:0:0:2
ns2.gdlicanet.net.mx. 2 AAAA 2806:20f:0:0:0:0:0:3
ns5.gdlicanet.net.mx. 2 AAAA 2806:20f:0:0:0:0:0:a14
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0