Question and response
Question
dig server4u.cz. NS
Answer
server4u.cz. 600 NS ns.web4u.cz.
server4u.cz. 600 NS ns2.web4u.cz.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0