Apex domains cannot have CNAME records.
Question and response
Question
dig qtlgslbcn.info. NS
Answer
qtlgslbcn.info. 5 NS i.qtlgslbcn.info.
qtlgslbcn.info. 5 NS f.qtlgslbcn.info.
qtlgslbcn.info. 5 NS g.qtlgslbcn.info.
qtlgslbcn.info. 5 NS h.qtlgslbcn.info.
Authority
The response has no authority records.
Additional
f.qtlgslbcn.info. 5 A 163.171.231.10
g.qtlgslbcn.info. 5 A 163.171.252.10
h.qtlgslbcn.info. 5 A 113.219.128.71
h.qtlgslbcn.info. 5 A 117.27.241.18
h.qtlgslbcn.info. 5 A 121.226.243.14
i.qtlgslbcn.info. 5 A 174.35.5.50
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0