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Is this IP really that AI bot?

When your server log shows a User-Agent such as "GPTBot" or "ClaudeBot", this checks whether the IP address of that request is really inside the IP ranges that the bot's operator publishes.

Privacy: migurei does not store or log the IP address and User-Agent you ask about. The request passes through Cloudflare like any web request. With the GET API the values are in the URL you send. No outside request is made. Only public internet IP addresses are accepted (private, loopback, link-local, CGNAT, multicast, documentation and reserved addresses are refused).

The four answers

  • verified: This IP address is inside the IP ranges that the operator of the bot named by the User-Agent publishes.
  • ip_not_in_feed: The User-Agent names a registered bot, but this IP address is not in the ranges its operator publishes. The request may only be borrowing the name.
  • no_feed: The User-Agent names a registered bot, but its operator publishes no IP ranges (or the snapshot has none), so this IP address cannot be checked. It does not mean the request is fake.
  • unknown_ua: This User-Agent matches none of the bots in the registry. It cannot be checked.

How it works

  • The User-Agent is matched against the bot registry (bot names and UA patterns); then the IP address (IPv4 or IPv6) is checked against the snapshot of the IP ranges that bot's operator publishes.
  • The data is only what this Worker bundled at build time; no outside request is made when you check. The answer names the bot, the feed and its URL, the snapshot date and the registry version.
  • "verified" only means the IP address is inside the operator's published ranges (it does not tell which of the operator's bots). The snapshot goes stale between updates.
  • API: GET /en/check/ai-bot-ip?ip=…&ua=… (JSON; HTML for a browser, Markdown for Accept: text/markdown). The MCP tool is verify_ai_bot (ip, user_agent).

Checking a whole site

For whether bots may fetch your site, use the free scan.