_sp.zucchetti.com has no CNAME records.
Question and response
Question
dig _sp.zucchetti.com. NS
Answer
The response has no answer records.
Authority
zucchetti.com. 223 SOA ns1.zucchetti.com. hostmaster.zucchetti.com. 2024062356 10800 3600 2419200 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0