ns2.mercaterra.es has no CNAME records.
Question and response
Question
dig ns2.mercaterra.es. NS
Answer
The response has no answer records.
Authority
mercaterra.es. 23 SOA ns1.mercaterra.es. root.mercaterra.es. 2024042911 7200 3600 1209600 180
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0