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About The DNS Tools

Last updated: 2026-08-17

The DNS Tools (thednstools.com) is a collection of fast, free DNS and network diagnostics. The tools run in your browser and send each query straight to a public resolver — never through a server of ours.

How it works

When you run a check, your browser sends the query directly to a public DNS-over-HTTPS resolver and renders the answer. There is no server of ours in between, so we never see what you looked up — but the resolver does, in the same way it would for any other DNS query.

Because there is no server round-trip, most operations are fast and work even on slower connections.

Free and no sign-up

Every core tool is free to use and does not require an account. There is no paywall for basic operations.

Private by design

A lookup only means anything if it reaches a resolver, so these queries do leave your device — that is the tool working, not a compromise. What does not happen is us collecting them: the request goes from your browser to the resolver and the answer comes back the same way.

Nothing else is sent anywhere. The tools do not upload files, and the site has no account system to attach a query to.

Honest about limitations

Each tool page explains exactly what the tool does, the options available, and any limitations — so you always know what to expect.

DNS Records13

  • DNS Lookup
  • A Record Lookup
  • AAAA Record Lookup
  • MX Record Lookup
  • TXT Record Lookup

IP & Network5

  • What Is My IP Address
  • Reverse DNS (PTR) Lookup
  • DNS Blacklist (DNSBL) Check
  • Domain Whois (RDAP) Lookup
  • ASN & IP Routing Lookup

Email & Deliverability3

  • SPF Record Checker
  • DMARC Record Checker
  • DKIM Record Checker

SSL & Certificates10

  • SSL Certificate Decoder
  • CSR Decoder
  • PEM to DER Converter
  • DER to PEM Converter
  • PFX to PEM Converter
The DNS Tools

DNS, email, and network diagnostics — no sign-up, nothing stored.

Every lookup runs from your browser against public DNS-over-HTTPS resolvers. Nothing you check is stored, and no query is sent to this site.

Product

  • All tools
  • DNS Lookup
  • SPF Checker

Company

  • About
  • Contact

Legal

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  • Terms
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© 2026 The DNS Tools. All processing happens in your browser.