mailer-02.artful.net has no NS records.
NS records for this zone are defined at artful.net.
NS records for this zone are defined at artful.net.
Question and response
Question
dig mailer-02.artful.net. NS
Answer
The response has no answer records.
Authority
artful.net. 18000 SOA ns0.fr.claradns.net. hostmaster.fr.clara.net. 2019022500 172800 3600 1728000 172800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0