ns3.nsgrid.net has no CNAME records.
Question and response
Question
dig ns3.nsgrid.net. NS
Answer
The response has no answer records.
Authority
nsgrid.net. 491 SOA ns1.nsgrid.net. dns.nsgrid.net. 2022181783 3600 600 43200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0