Which websites block Diffbot?

34 of 243 popular sites we measured block Diffbot (14%), checked 2026-10-01.

Diffbot is Diffbot’s crawler for knowledge graph (Diffbot). It builds an open corpus or knowledge graph that other products draw on. More about Diffbot.

The robots.txt rule

To block it:

User-agent: Diffbot
Disallow: /

To allow it explicitly:

User-agent: Diffbot
Allow: /

A server or CDN can still refuse the crawler when robots.txt allows it. That is why the checker fetches as the crawler as well as reading the file.

Sites that block Diffbot

Check your own site

The free checker runs the same probe on any URL: robots.txt resolved for every AI crawler, then a live fetch as each one, so a CDN or firewall block shows up even when robots.txt looks fine.

Check AI crawler access, free

Need it across every page? Site crawls start at $4.99 a month, and Pro adds monitoring that re-checks your URLs on a schedule.

Other crawlers

• Sites that block GPTBot
• Sites that block OAI-SearchBot
• Sites that block ChatGPT-User
• Sites that block ClaudeBot
• Sites that block Claude-SearchBot
• Sites that block Claude-User
• Sites that block Google-Extended
• Sites that block PerplexityBot
• Sites that block Perplexity-User
• Sites that block CCBot
• Sites that block Bytespider
• Sites that block Applebot-Extended
• Sites that block Meta-ExternalAgent
• Sites that block Amazonbot
• Sites that block cohere-ai
• Sites that block Timpibot