udns2.cscdns.net has no CNAME records.
Question and response
Question
dig udns2.cscdns.net. NS
Answer
The response has no answer records.
Authority
cscdns.net. 3460 SOA udns1.cscdns.net. hostmaster.cscdns.net. 2007080920 28800 7200 604800 14400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0