out.o2.cz has no NS records.
NS records for this zone are defined at o2.cz.
NS records for this zone are defined at o2.cz.
Question and response
Question
dig out.o2.cz. NS
Answer
The response has no answer records.
Authority
o2.cz. 10800 SOA dns.iol.cz. hostmaster.iol.cz. 2026030405 10800 3600 2592000 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0