MistralAI-Index: what it is and how to block it

Operator

Mistral AI

Type

Search

robots.txt token

MistralAI-Index

Follows robots.txt

Mistral AI doesn't say

IP ranges

Published

Blocked by name

0.2% of top sites

What is MistralAI-Index?

MistralAI-Index is Mistral AI's search crawler: it indexes pages for search results. In Mistral AI's words:

“MistralAI-Index is for automated crawling of the web for indexing purposes only. It indexes content for Mistral search, which helps answer user questions in Vibe.”

“Content crawled by MistralAI-Index is not used for generative AI training of any kind.”

MistralAI-Index user agent string

Mistral AI documents this user agent string for MistralAI-Index:

Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; MistralAI-Index/1.0; +https://docs.mistral.ai/robots)

In robots.txt, use the token MistralAI-Index, not the full string. Crawlers match on the token, and version numbers in the full string can change.

How many websites block MistralAI-Index?

In our Oct 8, 2026 check of 817 of the most-visited websites, 0.2% block MistralAI-Index by name for their whole site (2 sites).

For comparison, 0.1% of the same sites block Googlebot by name. The sites are the top 1,000 origins in the Chrome UX Report for August 2026; see how we measured.

How to block MistralAI-Index in robots.txt

Add this group to the robots.txt file at the root of your domain to block MistralAI-Index from your whole site:

User-agent: MistralAI-Index
Disallow: /

To block only part of your site, list those paths instead:

User-agent: MistralAI-Index
Disallow: /private/

A group that names MistralAI-Index replaces your User-agent: * rules for it entirely (RFC 9309). If your catch-all group blocks paths that MistralAI-Index should also stay out of, repeat them in its group. To let MistralAI-Index in while a catch-all rule blocks others:

User-agent: *
Disallow: /

User-agent: MistralAI-Index
Allow: /

Mistral AI doesn't say whether MistralAI-Index follows robots.txt, so a robots.txt block is a request it may not honor.

What happens if you block MistralAI-Index?

Mistral AI doesn't document what blocking MistralAI-Index changes.

How to verify requests from MistralAI-Index

Mistral AI publishes the IP addresses MistralAI-Index uses. Check a request's IP address against that list before trusting its user agent, which any client can fake.

Other Mistral AI crawlers

• MistralAI-Training · AI training
• MistralAI-User · User-triggered

See every AI crawler and how often top sites block it