smtp4.sunet.se has no NS records.
NS records for this zone are defined at sunet.se.
NS records for this zone are defined at sunet.se.
Question and response
Question
dig smtp4.sunet.se. NS
Answer
The response has no answer records.
Authority
sunet.se. 300 SOA hidden-master.sunet.se. hostmaster.sunet.se. 2026031501 14400 3600 864000 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0