Network & DNS Diagnostics BLOG
Network & DNS Diagnostics
IP lookups, DNS propagation, HTTP header inspection, and web performance.
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Network & DNS Diagnostics
2026-08-30
How to Check DNS Records & Troubleshoot Global DNS Propagation【完全解説・実践ガイド】
Master A, AAAA, CNAME, MX, TXT, and NS DNS records. Learn how TTL values influence global name server caching, and how to verify domain records online. 本記事では、基本的な仕組みから具体的な実践手順、活用テクニックまで徹底解説します。
6 min readRead Article
Network & DNS Diagnostics
2026-08-16
What is Reverse DNS (rDNS) & Why PTR Records Prevent Email Spam Filtering【完全解説・実践ガイド】
Learn how Pointer (PTR) records map IP addresses back to domain names. Discover why mail servers enforce Forward-Confirmed reverse DNS (FCrDNS) for spam rejection. 本記事では、基本的な仕組みから具体的な実践手順、活用テクニックまで徹底解説します。
5 min readRead Article
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