ns1.ignum.com has no CNAME records.
Question and response
Question
dig ns1.ignum.com. NS
Answer
The response has no answer records.
Authority
ignum.com. 285 SOA ns1.ignum.com. hostmaster.ignum.cz. 2024120502 10800 1800 604800 360
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0