ns1.sbs-inter.net has no CNAME records.
Question and response
Question
dig ns1.sbs-inter.net. NS
Answer
The response has no answer records.
Authority
sbs-inter.net. 2723 SOA ns1.sbs-inter.net. dnsmaster.atos.net. 2026030317 3600 300 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0