primary.guardeddns.net has no NS records.
NS records for this zone are defined at guardeddns.net.
NS records for this zone are defined at guardeddns.net.
Question and response
Question
dig primary.guardeddns.net. NS
Answer
The response has no answer records.
Authority
guardeddns.net. 900 SOA primary.guardeddns.net. dns-admin.guardeddns.net. 192 28800 450 1209600 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0