boris.ovh.bearstech.com has no CNAME records.
Question and response
Question
dig boris.ovh.bearstech.com. NS
Answer
The response has no answer records.
Authority
ovh.bearstech.com. 3600 SOA ns1.server.net. hostmaster.server.net. 423 10800 300 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0