_spf-shared.si-shell.net has no CNAME records.
Question and response
Question
dig _spf-shared.si-shell.net. NS
Answer
The response has no answer records.
Authority
si-shell.net. 3368 SOA ns1.freedns.si. info.si-shell.net. 2026030500 600 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0