bh1516.svc.2iij.net has no NS records.
NS records for this zone are defined at svc.2iij.net.
NS records for this zone are defined at svc.2iij.net.
Question and response
Question
dig bh1516.svc.2iij.net. NS
Answer
The response has no answer records.
Authority
svc.2iij.net. 86400 SOA dns0.iij.ad.jp. postmaster.iij.ad.jp. 100583 3600 1800 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0