server.nordu.net has no CNAME records.
Question and response
Question
dig server.nordu.net. NS
Answer
The response has no answer records.
Authority
nordu.net. 300 SOA hidden-master.nordu.net. hostmaster.nordu.net. 2026030400 14400 3600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0