spf.visp.net has no CNAME records.
Question and response
Question
dig spf.visp.net. NS
Answer
The response has no answer records.
Authority
spf.visp.net. 300 SOA ns.visp.net. hostmaster.visp.net. 2026022002 3600 3600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0