poczta.fl.netia.pl has no NS records.
NS records for this zone are defined at fl.netia.pl.
NS records for this zone are defined at fl.netia.pl.
Question and response
Question
dig poczta.fl.netia.pl. NS
Answer
The response has no answer records.
Authority
fl.netia.pl. 86400 SOA ns1.futuro.pl. dns.netia.pl. 2018092205 10800 1800 604800 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0