NERDTOOLS / DOMAIN DIAGNOSTICS
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01 / DIAGNOSE

Start with a domain or public IP.

Hide results ? When enabled, this scan will not appear in the most recent searches or the scan 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 2095 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 multibeam.co.uk Oct 6, 06:39
  2. #2 galogin.net Oct 6, 05:43
  3. #3 quicklube.co.uk Oct 6, 05:42
  4. #4 anzeckplastic.co.uk Oct 6, 05:36
  5. #5 dianabrook.co.uk Oct 6, 05:34

Tool Detail Page

SSL Certificate Check for dianabrook.co.uk

Cached SSL data indicates the certificate for dianabrook.co.uk is valid with 63 days remaining.

Valid certificate

Cached Tool Summary

Cached SSL data indicates the certificate for dianabrook.co.uk is valid with 63 days remaining.

Last cached scan: 2026-10-06 05:34 UTC

Key Facts

  • Days remaining: 63
  • Valid until: 2026-12-09
  • Issuer: YR1
  • Subject: dianabrook.co.uk

Key Findings

  • Hostname validation was included in the cached TLS check.
Full scan page Canonical public report for dianabrook.co.uk. Auth.md Check Supporting detail view for the canonical scan page. Blacklist Check Supporting detail view for the canonical scan page. CAA Check Supporting detail view for the canonical scan page. DMARC Check Supporting detail view for the canonical scan page. Domain Expiry Check Supporting detail view for the canonical scan page. DKIM Check Supporting detail view for the canonical scan page. DNS Lookup Supporting detail view for the canonical scan page. DNSSEC Check Supporting detail view for the canonical scan page. IP Info Supporting detail view for the canonical scan page. IP Reputation Supporting detail view for the canonical scan page. MX Check Supporting detail view for the canonical scan page. LLMs.txt Check Supporting detail view for the canonical scan page. Robots.txt Checker Supporting detail view for the canonical scan page. Redirect Check Supporting detail view for the canonical scan page. SEO Check Supporting detail view for the canonical scan page. Ping Supporting detail view for the canonical scan page. Port Scan Supporting detail view for the canonical scan page. SPF Check Supporting detail view for the canonical scan page. SSL Certificate Check Supporting detail view for the canonical scan page. TLS Protocol Check Supporting detail view for the canonical scan page. Security Headers Check Supporting detail view for the canonical scan page. Security.txt Check Supporting detail view for the canonical scan page. Sitemap Checker Supporting detail view for the canonical scan page. WHOIS Lookup Supporting detail view for the canonical scan page.

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 /api/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 Core Web Vitals Quick Check Indexation Checker