ns1.xta.cat has no CNAME records.
Question and response
Question
dig ns1.xta.cat. NS
Answer
The response has no answer records.
Authority
xta.cat. 2928 SOA ns1.xta.cat. joan.xta.cat. 2026022502 86400 7200 3600000 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0