11.36.ciberserver.com has no CNAME records.
Question and response
Question
dig 11.36.ciberserver.com. NS
Answer
The response has no answer records.
Authority
36.ciberserver.com. 2504 SOA ns1.ciberserver.com. status.ciberconceito.com. 2022071400 3600 7200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0