spf.domena.pl has no NS records.
NS records for this zone are defined at domena.pl.
NS records for this zone are defined at domena.pl.
Question and response
Question
dig spf.domena.pl. NS
Answer
The response has no answer records.
Authority
domena.pl. 10800 SOA ns1.domena.pl. bok.domena.pl. 2007064095 7200 1800 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0