mx.edu.hu has no CNAME records.
Question and response
Question
dig mx.edu.hu. NS
Answer
The response has no answer records.
Authority
edu.hu. 3110 SOA ns2.iif.hu. hostmaster.iif.hu. 2026021903 43200 7200 2592000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0