relay01.brennercom.it has no CNAME records.
Question and response
Question
dig relay01.brennercom.it. NS
Answer
The response has no answer records.
Authority
brennercom.it. 253 SOA marek.ns.cloudflare.com. dns.cloudflare.com. 2397091565 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0