Crawlability (Robots & Sitemaps)

Crawlability is the foundation of SEO. If a search engine or AI bot can't discover your pages, your content will never appear in search results or AI citations. 42crawl's Crawlability Report audits the two main "gatekeepers" of your site: robots.txt and XML Sitemaps. This is a critical first step for technical SEO and GEO optimization.

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Robots.txt Analysis

The robots.txt file is a set of instructions for web robots. It tells them which parts of your site they should and should not crawl.

What 42crawl Checks:

• Availability: We verify your robots.txt file is properly hosted.
• Syntax Validation: We check for formatting errors that might cause crawlers to ignore your rules.
• User-Agent Rules: We break down rules by SEO crawler (e.g., Googlebot, Bingbot, or AI bots) so you can see who is blocked.
• Crawl Delay Detection: We identify directives that might be slowing down your indexing.
• Sitemap Reference: We ensure your XML sitemap is linked to help bots find it.

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XML Sitemap Analysis

An XML sitemap is a map of your website that tells search engines which pages are important and how often they change.

What 42crawl Checks:

• Sitemap Discovery: We look for sitemaps in your robots.txt and at default locations.
• URL Consistency: We cross-reference sitemap URLs with our crawl results.
• Orphan Discovery: We find "Orphan Pages"—URLs that are in your sitemap but have no internal links.
• Sitemap Bloat: We identify URLs that are blocked or have noindex tags (wasting crawl budget).
• Nested Sitemaps: We support Sitemap Indexes and nested files.

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Common Crawlability Pitfalls

• Accidental Blocks: A misplaced / can hide your entire site from Google and AI bots.
• Outdated Sitemaps: Sitemaps with 404 pages or old redirects signal a lack of maintenance.
• AI Bot Blocking: 42crawl helps you verify if you are accidentally blocking AI crawlers (like GPTBot) and hurting your generative engine optimization.

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How to Use the Report

Navigate to the Crawlability tab in your 42crawl dashboard.

1. Review the robots.txt summary: Ensure important pages are Allowed.
2. Check Sitemap Coverage: Identify discovery gaps.
3. Fix High-Priority Issues: Address 404s in your sitemap to improve your technical SEO.
4. Monitor Core Web Vitals: Ensure your sitemap leads bots to fast, high-quality pages.

Next Steps:

• Learn about AI Discovery and llm.txt.
• Test if AI bots are blocked at the infrastructure level.