1. DNS健全性チェッカー

http://www.e-ontap.com/dns/health/

以下のサーバは応答がありません
一時的な停止かトラブル または Lame Delegation の可能性があります
無駄な問い合わせが発生し、返答に時間がかかる可能性があります
また、場合により乗っ取りされる可能性があるかもしれません!

 tg1.sharp.co.jp
 ns1.sharp.co.jp

以上

2. Zone Master

https://zonemaster.net/result/41d7062da674a4df

BASIC INFO
Parent domain 'sharp' was found for the tested domain.

BASIC WARNING
Nameserver ns1.sharp.co.jp/61.214.248.154 reponds to a SOA query with no SOA records in the answer ection.

BASIC WARNING
Nameserver ns1.sharp.co.jp/61.214.248.154 reponds to a NS query with no NS records in the answer section.

BASIC WARNING
Nameserver tg1.sharp.co.jp/61.214.248.155 reponds to a SOA query with no SOA records in the answer ection.

BASIC WARNING
Nameserver tg1.sharp.co.jp/61.214.248.155 reponds to a NS query with no NS records in the answer section.

BASIC ERROR
Nameserver ns1.sharp.co.jp/61.214.248.154 did not return NS records. RCODE was NOERROR.

BASIC ERROR
Nameserver tg1.sharp.co.jp/61.214.248.155 did not return NS records. RCODE was NOERROR. 

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