NERDTOOLS / FIND YOUR NEXT FIX
Check a website All tools Developers Find my problem

Something wrong with your website? Start here.

Check your website and email setup, find issues worth investigating, and see where to start. Free, with no account required.

Free check · public websites and IPs
Have a specific problem? Find your starting point below.

What brought you here?

You don’t need to know which technical check to run. Start with what you’re trying to solve.

My emails aren’t arriving.

Inspect the domain setup behind your email and work through common delivery issues.

Investigate email delivery

I’m launching or moving a site.

Work through DNS, HTTPS, redirects and search visibility before and after the move.

Use the launch checklist

My site isn’t showing in search.

Look for access problems, indexing restrictions and missing discovery signals.

Check search visibility

Just checking things over? Start with domain health. Already moved? Use the migration checklist.

A finding should give you a next step.

Start with what needs attention. Open the evidence when you need the detail. Recheck after a fix to see whether the issue is resolved.

Check your website

Example finding · illustrative, not a live scan

A noindex instruction was found.

Why it matters
This tells search engines not to include the page in search results.
Where to start
If the page should appear in search, review its robots meta tag and X-Robots-Tag header. Some pages are intentionally excluded.
After your change
Run the check again to verify the instruction is gone. Search engines still need time to revisit the page.
Read the noindex guide

Know what you’re looking for?

Go straight to a check, or use the scanner below to choose from the full toolbox.

DNS lookup SSL certificate SPF record DMARC policy Redirects Explore all tools →

The same tools, inside your workflow.

Building software or an agent? Use the REST API and MCP server to bring domain checks into your product.

Explore the developer platform

Choose an individual check.

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

Opening a target runs a fresh check. Only public browser scans appear here.

What people are checking.

IncludedPublic web scans ExcludedAPI + MCP

Leaderboard

Most scanned targets

  1. #1 google.com 2111 scans
  2. #2 nerdtools.co.uk 1760 scans
  3. #3 stiftelse-forum.se 1746 scans
  4. #4 pedago.se 1699 scans
  5. #5 joehuggans.dev 1601 scans

Recent scans

Latest public activity

  1. #1 idahofoodbankfund.org Oct 18, 21:17
  2. #2 minteori.se Oct 18, 21:10
  3. #3 planetmars.co.uk Oct 18, 21:07
  4. #4 grantreid.co.uk Oct 18, 20:57
  5. #5 willem-jan.net Oct 18, 20:47