NERDTOOLS / DOMAIN DIAGNOSTICS
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FREE DOMAIN INTELLIGENCE 30 PUBLIC CHECKS

Check your website and domain health.

Find DNS, email, TLS, security, availability and SEO problems in one scan. No account required.

Public targets only · no account required
Building a product or agent? Explore the API + MCP platform

01 / DIAGNOSE

Start with a domain or public IP.

? The report URL still works, but the target will not appear in recent scans or the leaderboard.

PUBLIC ACTIVITY / WEB SCANS ONLY

What people are checking.

IncludedPublic web scans ExcludedAPI + MCP

01 / POPULAR

Leaderboard

Most scanned targets

  1. #1 google.com 2104 scans
  2. #2 nerdtools.co.uk 1757 scans
  3. #3 stiftelse-forum.se 1745 scans
  4. #4 pedago.se 1699 scans
  5. #5 joehuggans.dev 1601 scans

02 / LIVE

Recent scans

Latest public activity

  1. #1 thewiggleroom.net Oct 9, 22:27
  2. #2 netbond.net Oct 9, 22:24
  3. #3 x-cad.net Oct 9, 22:21
  4. #4 pertsch.net Oct 9, 22:16
  5. #5 myshapeit.co.uk Oct 9, 22:09

02 / INTEGRATE

From one-off diagnosis to in-product intelligence.

The browser is for investigation. The API and MCP server are for repeatable workflows—monitoring domains, enriching customer data, validating email setup, and giving agents reliable DNS tools.

Full API + MCP coverage: Every read-only diagnostic is available on Free and Pro. Plans differ by quota and rate limits.

Explore the developer platform Create a developer account
REST / V1MCP / HTTPONLINE
GET https://api.nerdtools.co.uk/v1/email/dmarc
  ?domain=example.com

Authorization: Bearer nt_live_…

200  { "ok": true,
       "data": { "policy": "reject" } }

Same key. Same quota. Structured JSON for software and agents.

03 / ACCESS

Start free. Pay when diagnostics become infrastructure.

WEB SCAN

£0 / open access

For individual investigations and shareable public reports.

  • Full browser diagnostic
  • No registration required
  • 30 focused checks
Run a scan

DEVELOPER FREE

£0 / developer

For testing the REST API and MCP server in real workflows.

  • 100 requests / day
  • 10 requests / minute
  • REST + MCP: complete diagnostic catalog
Get a free key
FOR PRODUCTION

PRO

£19 / monthly

For products, automations and agents that depend on domain signals.

  • 10,000 requests / month
  • 60 requests / minute
  • REST + MCP: complete diagnostic catalog
Start with Pro

The checkout total is shown before payment. No charge is made until you approve it.

04 / WORKFLOWS

Start with the problem, not the protocol.

Follow a deliberate diagnostic sequence for the moments when several public systems have to agree.

Email deliverability check Email authentication check Website launch checklist Website migration checklist Website not indexed Domain health check

05 / COVERAGE

30 checks. One diagnostic surface.

Inspect the whole domain or go directly to a single signal.

Website Down Detector WHOIS Lookup Domain Expiry Checker DNS Lookup Tool DNSSEC Checker SSL Certificate Checker TLS Protocol Checker Security Headers Checker Redirect Checker SEO Check Tool SPF Record Checker DMARC Record Checker DKIM Record Checker CAA Record Checker MX Record Checker Blacklist Check IP Info Lookup IP Reputation Check Online Ping Tool Online Port Scanner Robots.txt Checker Security.txt Checker Auth.md Checker LLMs.txt Checker XML Sitemap Checker Schema Markup Tester Meta Tag & Open Graph Preview Broken Link Checker Website Performance Quick Check Website Indexability Checker