mx01.broadband.hu has no CNAME records.
Question and response
Question
dig mx01.broadband.hu. NS
Answer
The response has no answer records.
Authority
broadband.hu. 2583 SOA ns01.broadband.hu. netsup.infraco.hu. 2026030602 86400 14400 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0