mail.arcom.net.pl has no NS records.
NS records for this zone are defined at arcom.net.pl.
NS records for this zone are defined at arcom.net.pl.
Question and response
Question
dig mail.arcom.net.pl. NS
Answer
The response has no answer records.
Authority
arcom.net.pl. 3600 SOA dns.home.pl. admin.home.pl. 1574234629 14400 7200 2419200 3600
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0