What tools can help diagnose a 'website not found error'?

Several tools are invaluable for diagnosing 'website not found errors': 1. **Browser Developer Tools:** The 'Network' tab (usually accessed by pressing F12) shows the HTTP status code for every request, clearly indicating a 404. 2. **Google Search Console (GSC):** Its 'Crawl errors' report specifically lists 404s encountered by Googlebot on your site, providing insight into which pages are affected and where they're linked from. 3. **Website Crawler Tools:** Tools like Screaming Frog SEO Spider, Ahrefs Site Audit, or SEMrush Site Audit can crawl your entire site to find all broken links (404s). 4. **Server Log Analyzers:** Software that parses Apache, Nginx, or IIS logs can highlight frequently occurring 404 errors and the URLs causing them. 5. **Online HTTP Status Checkers:** Websites like `httpstatus.io` allow you to quickly check the HTTP status code for any given URL. 6. **DNS Lookup Tools:** While not directly for 404s, these tools confirm if your domain's DNS is resolving correctly, helping differentiate between a 404 and a 'server not found' error.