doc.vipowernet.net has no CNAME records.
Question and response
Question
dig doc.vipowernet.net. NS
Answer
The response has no answer records.
Authority
vipowernet.net. 4708 SOA ns1.vipowernet.net. richard_wright.iccvi.com. 2015032237 10800 3600 604800 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0