Poseidon Research

A representative user-agent string. Version numbers change; the Poseidon Research Crawler token does not. Paste your own log line into the user-agent checker to confirm a match.

Add this to the robots.txt at the root of your domain. Robots.txt is advisory: it works only on crawlers that choose to read it. This one is undocumented. To enforce a block, match the user agent at your CDN or web server and return 403.

To block every training crawler at once, or to block training while keeping AI search citations, use the robots.txt generator.

A more specific User-agent group wins over a wildcard. Place this above any User-agent: * block that disallows paths, and Poseidon Research keeps full access.

The user-agent string is self-asserted: anyone can send it from a laptop, and scrapers routinely impersonate well-known crawlers to slip past filters aimed at unknown ones.

No published ranges.