ns2.sap.de has no CNAME records.
Question and response
Question
dig ns2.sap.de. NS
Answer
The response has no answer records.
Authority
sap.de. 10800 SOA ns.sap-ag.de. dns.sap-ag.de. 2026013001 14400 5400 1814400 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0