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DNS-over-HTTPS (DoH) Record Resolver & Diagnostic Inspector

Resolve and inspect DNS records (A, AAAA, MX, TXT, CNAME, PTR, CAA) client-side via DNS-over-HTTPS (Cloudflare, Google, Quad9) with DNSSEC validation.

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📡DNS-over-HTTPS (DoH) Record Resolver & Diagnostic Inspector Documentation & Guide

Web & Developer

📋How to Use DNS-over-HTTPS (DoH) Record Resolver & Diagnostic Inspector

  1. Enter Hostname & Select Record Type: Specify the domain name or IP address and choose the DNS record type (A, AAAA, MX, TXT, CNAME, PTR, CAA, NS, or SOA).
  2. Choose Anycast DoH Provider: Select from major encrypted resolvers including Cloudflare (1.1.1.1), Google Public DNS (8.8.8.8), or Quad9 Security (9.9.9.9).
  3. Query & Inspect DNSSEC Validation: Execute the query via secure HTTPS, view returned IP answers with TTLs, and inspect cryptographic DNSSEC validation flags (AD bit).

⚙️DNS-over-HTTPS (RFC 8484) Architecture & Wire Format

DNS-over-HTTPS encapsulates traditional UDP port 53 DNS queries within TLS-encrypted HTTP/2 and HTTP/3 streams over standard port 443:

• RFC 8484 Protocol: Queries travel over HTTPS, shielding host lookups from ISP eavesdropping and on-path DNS hijacking
• RFC 8427 JSON Mapping: Queries utilize application/dns-json payloads parsing header status codes, response flags, and answer sets
• DNSSEC Authentication: The AD (Authentic Data) response bit verifies that records were cryptographically signed by authoritative zone keys
• Latency & Anycast: Global anycast BGP routing resolves DoH queries at nearest geographic edge nodes in under 20 milliseconds
• 100% Client-Side Dispatch: Queries execute directly from browser fetch requests with zero intermediate proxy tracking

DoH enables reliable end-to-end DNS diagnostics without relying on local operating system resolver caching or ISP tampering.

💡Practical DNS-over-HTTPS Use Cases

  • Troubleshooting global DNS propagation and verification of newly configured A, AAAA, and CNAME records.
  • Auditing email authentication TXT records (SPF, DKIM, DMARC) across different authoritative resolvers.
  • Bypassing local recursive DNS cache poisoning to inspect live upstream root server responses.
100% Client-Side Privacy Guarantee:All calculations, text manipulation, cryptographic hashing, and media conversions execute exclusively within your local browser sandbox. Zero user inputs, financial amounts, credentials, or proprietary files are ever transmitted across networks or logged on external servers.
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