ns2.procono.es has no CNAME records.
Question and response
Question
dig ns2.procono.es. NS
Answer
The response has no answer records.
Authority
procono.es. 3600 SOA ns1.procono.es. datos.ptvtelecom.com. 2014033143 1200 600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0