dmail.kagoya.net has no NS records.
NS records for this zone are defined at kagoya.net.
NS records for this zone are defined at kagoya.net.
Question and response
Question
dig dmail.kagoya.net. NS
Answer
The response has no answer records.
Authority
kagoya.net. 600 SOA ns.kagoya.net. root.kagoya.net. 2026030900 3900 300 360000 600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0