ns.domrobot.com has no CNAME records.
Question and response
Question
dig ns.domrobot.com. NS
Answer
The response has no answer records.
Authority
domrobot.com. 3600 SOA ns.domrobot.com. hostmaster.inwx.de. 2026021803 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0