rt.netprotect.ro has no CNAME records.
Question and response
Question
dig rt.netprotect.ro. NS
Answer
The response has no answer records.
Authority
netprotect.ro. 3379 SOA ns1.netprotect.ro. alex.netprotect.ro. 2026010804 28800 7200 10800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0