ns1.sap.net has no CNAME records.
Question and response
Question
dig ns1.sap.net. NS
Answer
The response has no answer records.
Authority
sap.net. 600 SOA ns.sap-ag.de. dns.sap-ag.de. 2025122202 43200 1800 1814400 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0