ns3.slovanet.net has no CNAME records.
Question and response
Question
dig ns3.slovanet.net. NS
Answer
The response has no answer records.
Authority
slovanet.net. 2288 SOA ns.slovanet.net. dns.slovanet.net. 2026020502 7200 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0