ns1.db-center.net has no NS records.
NS records for this zone are defined at db-center.net.
NS records for this zone are defined at db-center.net.
Question and response
Question
dig ns1.db-center.net. NS
Answer
The response has no answer records.
Authority
db-center.net. 600 SOA ns1.db-center.net. webmaster.iqnet.co.jp. 2024120501 3600 600 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0