f05.oxemis.net has no CNAME records.
Question and response
Question
dig f05.oxemis.net. NS
Answer
The response has no answer records.
Authority
oxemis.net. 5409 SOA ns.oxemis.net. postmaster.oxemis.net. 2025110302 10800 3600 1209600 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0