alertsys.hringdu.is has no NS records.
NS records for this zone are defined at hringdu.is.
NS records for this zone are defined at hringdu.is.
Question and response
Question
dig alertsys.hringdu.is. NS
Answer
The response has no answer records.
Authority
hringdu.is. 300 SOA ns1.hringdu.is. hostmaster.hringdu.is. 1771509230 86400 7200 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0