ns2.tecnovenca.net has no CNAME records.
Question and response
Question
dig ns2.tecnovenca.net. NS
Answer
The response has no answer records.
Authority
tecnovenca.net. 10582 SOA ns1.tecnovenca.net. contacto.tecnovenca.net. 1583043111 10800 3600 604800 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0