MJ12bot
Majestic · Other bots · User agent only
About this crawler
Majestic's crawler for its link index.
Usually means: A product is checking the page for a specific job: an ad review, a link preview, a feed or an SEO index.
User agent
MJ12bot
MetricRaven matches this token anywhere in the request's user agent, ignoring case. Operators add version numbers and browser text around it, for example "MJ12bot/1.0".
IP verification
Majestic publishes no IP ranges for MJ12bot, so requests are identified by user agent only and recorded as unverified. Anyone can send this user agent.
Control it in robots.txt
User-agent: MJ12bot Disallow: /private/
Well-behaved crawlers re-read robots.txt within a day or so.
Questions
- What is MJ12bot?
- Majestic's crawler for its link index. MetricRaven groups it under Other bots: ad checks, link previews, feed readers, SEO tools and other bots.
- How do I verify that a request really comes from MJ12bot?
- Majestic publishes no IP ranges for MJ12bot, so only the user agent identifies it. Anyone can send that string, so treat it as a claim.
- How do I block or allow MJ12bot?
- Add a robots.txt group for "MJ12bot" with the paths to allow or disallow. Fetchers that act for a user may ignore robots.txt; block those at your server or firewall instead.
- How can I see when MJ12bot visits my website?
- Most crawlers never run JavaScript, so browser analytics miss them. MetricRaven's @metricraven/ai-crawl package reports crawler requests from your server, verifies their IPs against published ranges, and shows which pages each crawler reads.
See when AI assistants and crawlers read your site
Add one line to your server and MetricRaven shows which assistants, search engines and training crawlers request your pages, which ones are IP-verified, and the URLs they expected to find, including 404s.