frogstar.hit.bme.hu has no CNAME records.
Question and response
Question
dig frogstar.hit.bme.hu. NS
Answer
The response has no answer records.
Authority
hit.bme.hu. 5404 SOA pavo.hit.bme.hu. hostmaster.hit.bme.hu. 2025120800 10800 3600 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0