mail.sprintdatacenter.pl has no NS records.
NS records for this zone are defined at sprintdatacenter.pl.
NS records for this zone are defined at sprintdatacenter.pl.
Question and response
Question
dig mail.sprintdatacenter.pl. NS
Answer
The response has no answer records.
Authority
sprintdatacenter.pl. 3600 SOA ns1.sprintdatacenter.pl. dns.sprint.com.pl. 2025101501 3600 3600 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0