mail3907.novinky.o2.cz has no NS records.
NS records for this zone are defined at novinky.o2.cz.
NS records for this zone are defined at novinky.o2.cz.
Question and response
Question
dig mail3907.novinky.o2.cz. NS
Answer
The response has no answer records.
Authority
novinky.o2.cz. 10800 SOA ns1.silverpop.com. dnsadmin.silverpop.com. 2022051500 28800 7200 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0