backup1.dbnoc.net has no CNAME records.
Question and response
Question
dig backup1.dbnoc.net. NS
Answer
The response has no answer records.
Authority
dbnoc.net. 5948 SOA dns1.hrnoc.net. hostmaster.hrnoc.net. 2026012701 28800 7200 2419200 7200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0