rh1.exsbs.net has no CNAME records.
Question and response
Question
dig rh1.exsbs.net. NS
Answer
The response has no answer records.
Authority
exsbs.net. 424 SOA ns2.exsbs.net. hostmaster.digitalagent.net. 2005060207 43200 43200 43200 43200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0