mail.granatua.net has no NS records.
NS records for this zone are defined at granatua.net.
NS records for this zone are defined at granatua.net.
Question and response
Question
dig mail.granatua.net. NS
Answer
The response has no answer records.
Authority
granatua.net. 1800 SOA nsa1.srv53.net. support.dnshosting.org. 1773917524 1800 600 2419200 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0