_netblocks.site4now.net has no CNAME records.
Question and response
Question
dig _netblocks.site4now.net. NS
Answer
The response has no answer records.
Authority
site4now.net. 10800 SOA ns1.site4now.net. info.site4now.net. 2026022403 10800 3600 1296000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0