ns.xemis.net has no CNAME records.
Question and response
Question
dig ns.xemis.net. NS
Answer
The response has no answer records.
Authority
xemis.net. 6349 SOA ns.xemis.net. xemis.xemis.net. 2021112301 10800 3600 1209600 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0