sup4284511.lnk.telstra.net has no CNAME records.
Question and response
Question
dig sup4284511.lnk.telstra.net. NS
Answer
The response has no answer records.
Authority
lnk.telstra.net. 3719 SOA dns0.telstra.net. hostmaster.telstra.net. 2021365058 10800 3600 604800 6400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0