ns1.grupoloading.com has no CNAME records.
Question and response
Question
dig ns1.grupoloading.com. NS
Answer
The response has no answer records.
Authority
grupoloading.com. 3149 SOA ns1.grupoloading.com. servidores.loading.es. 2019042401 10800 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0