ns2.netdatacomm.cz has no CNAME records.
Question and response
Question
dig ns2.netdatacomm.cz. NS
Answer
The response has no answer records.
Authority
netdatacomm.cz. 600 SOA ns.netdatacomm.cz. noc.netdatacomm.cz. 2026022401 3600 600 1209600 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0