mail01.ipfire.org has no NS records.
NS records for this zone are defined at ipfire.org.
NS records for this zone are defined at ipfire.org.
Question and response
Question
dig mail01.ipfire.org. NS
Answer
The response has no answer records.
Authority
ipfire.org. 300 SOA master.lwldns.net. hostmaster.ipfire.org. 2026025731 10800 1800 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0