mamlas.feela.net has no CNAME records.
Question and response
Question
dig mamlas.feela.net. NS
Answer
The response has no answer records.
Authority
feela.net. 61540 SOA trubka.network.cz. feela.network.cz. 2018011718 3600 600 1814400 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0