AI2Bot
Allen Institute for AI · Model training · robots.txt token ai2bot
2% of 30,177 measured domains disallow ai2bot in robots.txt at the site root. Separately, and independently of robots.txt, 17.4% of 30,185 reachable domains refuse an AI crawler user agent at the network edge on two consecutive probes from different locations - a refusal the site's own robots.txt does not declare and its owner often has not chosen.
Measured 2026-10-06 by direct request to every domain in the corpus. Method: how this is measured. Reuse under CC BY 4.0 with attribution.
Cite as: Crawl Census, "AI2Bot blocking rate", measured 2026-10-06. https://crawlcensus.com/bot/ai2bot
What it is definition
Collects web text for Ai2's open datasets used to train open language models such as OLMo.
AI2Bot is operated by Allen Institute for AI and classified here as model training. These agents collect text and images that may end up in a training corpus. Disallowing one withholds new content from the next model. It does not withdraw anything collected before the disallow, and it does not remove the site from any answer engine.
Disallowing ai2bot withholds content crawled from that point on from Allen Institute for AI's training data. It does not withdraw pages collected in earlier crawls, it does not reach copies already sitting in third-party datasets, and it does not remove the site from any answer surface.
- robots.txt token
- ai2bot
- Operator
- Allen Institute for AI
- Purpose
- Model training
- Honors robots.txt
- yes
- Documentation
- https://allenai.org/crawler
Identity on the wire exact string
AI2Bot/1.0curl -A 'AI2Bot/1.0' https://example.com/Replace the host with your own. A 403, a challenge page or an empty body means the edge is blocking the agent whatever robots.txt says.
How to allow it, how to block it robots.txt
User-agent: ai2bot
Allow: /Absent any rule, the agent is already allowed, so this group only matters when your * group disallows something. Naming the agent replaces the * group for it entirely, so repeat here every disallow you still want to apply to it.
User-agent: ai2bot
Disallow: /Disallowing ai2bot withholds content crawled from that point on from Allen Institute for AI's training data. It does not withdraw pages collected in earlier crawls, it does not reach copies already sitting in third-party datasets, and it does not remove the site from any answer surface.
Sites that block it 60 shown
See every measured domain that blocks AI2Bot
This list is served from a cache rebuilt just now. It is discarded the moment a rescan records a policy change for this agent, so a site that has just changed its robots.txt will drop off it within one scan rather than waiting for the cache to expire.
Compare Allen Institute for AI
Allen Institute for AI runs no other agent in this registry.
Common questions answered
Does blocking AI2Bot remove me from Ai2's open datasets?
No, not by itself. AI2Bot collects content for training, not for the index that answers questions. Allen Institute for AI operates no separate answer crawler in this registry, so there is no answer surface to lose here. Content collected before the disallow is not withdrawn.
How do I verify AI2Bot requests are genuine?
Allen Institute for AI publishes neither reverse DNS names nor address ranges for AI2Bot, so a request carrying this user agent cannot be authenticated. The string is trivially spoofed and is routinely reused by unrelated scrapers. Treat it as a hint, rate-limit by source address, and do not grant it access you would not grant an anonymous client.
Check your own site free
See whether your robots.txt admits AI2Bot today, and whether your edge agrees with it.