ns2.iot247.net has no CNAME records.
Question and response
Question
dig ns2.iot247.net. NS
Answer
The response has no answer records.
Authority
iot247.net. 2643 SOA ns1.iot247.net. hostmaster.iot247.net. 2025052202 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0