ns2.xta.cat has no CNAME records.
Question and response
Question
dig ns2.xta.cat. NS
Answer
The response has no answer records.
Authority
xta.cat. 3600 SOA ns1.xta.cat. joan.xta.cat. 2026022502 86400 7200 3600000 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0