d-mx1.utp.edu.pl has no NS records.
NS records for this zone are defined at utp.edu.pl.
NS records for this zone are defined at utp.edu.pl.
Question and response
Question
dig d-mx1.utp.edu.pl. NS
Answer
The response has no answer records.
Authority
utp.edu.pl. 900 SOA sun1.utp.edu.pl. please_set_email.absolutely.nowhere. 2011046281 10800 3600 2419200 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0