ns2.nsgrid.net has no CNAME records.
Question and response
Question
dig ns2.nsgrid.net. NS
Answer
The response has no answer records.
Authority
nsgrid.net. 1713 SOA ns1.nsgrid.net. dns.nsgrid.net. 2022181003 3600 600 43200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0