mail.pilsfree.net has no NS records.
NS records for this zone are defined at pilsfree.net.
NS records for this zone are defined at pilsfree.net.
Question and response
Question
dig mail.pilsfree.net. NS
Answer
The response has no answer records.
Authority
pilsfree.net. 300 SOA ens.pilsfree.net. hostmaster.pilsfree.net. 2603260431 28800 7200 2419200 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0