dns2.equant.net has no CNAME records.
Question and response
Question
dig dns2.equant.net. NS
Answer
The response has no answer records.
Authority
equant.net. 2122 SOA dns1.equant.net. dns\.operations.orange.com. 2015041714 21600 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0