191.ip-51-68-189.eu has no CNAME records.
Question and response
Question
dig 191.ip-51-68-189.eu. NS
Answer
The response has no answer records.
Authority
ip-51-68-189.eu. 46 SOA dns10.ovh.net. tech.ovh.net. 2020120200 86400 3600 3600000 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0