ns03.telstraglobal.net has no CNAME records.
Question and response
Question
dig ns03.telstraglobal.net. NS
Answer
The response has no answer records.
Authority
telstraglobal.net. 10800 SOA ns03.telstraglobal.net. ipnoc.telstraglobal.net. 2026030600 3600 3600 3600000 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0