What is MJ12bot?
MJ12bot is Majestic's crawler. It maps the link relationships between websites for the data served at Majestic.com, using a distributed, community-run crawler.
- Operator
- Majestic
- Purpose
- Maps links between websites for Majestic's link index.
- robots.txt token
MJ12bot- How to verify
- Majestic's crawler is distributed and uses no fixed IP blocks. Majestic offers a site-specific identification string instead.
- Operator documentation
- https://mj12bot.com/
- Last verified
How often is MJ12bot impersonated?
No published method checks a request that claims to be MJ12bot, so we cannot say which claims are false and show no share.
This directory measures requests between 14 July 2026 and 10 October 2026. The fake crawler report covers its own, earlier window (late June to 21 September 2026), so its figures differ from the ones here. Read it for the method.
Have a request that claims to be MJ12bot? Check its IP address.
Should you block MJ12bot?
- Allow it if
- you or your partners use this tool's backlink or audit data, or the crawl load is not a concern.
- Block it if
- the crawl load is noticeable and you have no use for the tool's data. Blocking it does not affect search rankings.
- What blocking changes
- Majestic stops crawling your site for its link index.
To block it, add this group to your robots.txt. Majestic says MJ12bot obeys robots.txt and Crawl-delay up to 20 seconds.
User-agent: MJ12bot
Disallow: /robots.txt only asks. It does nothing against a client that ignores it or only pretends to be MJ12bot. Stopping those takes verification at your edge.
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- DataForSeoBot (DataForSEO): Adds links to DataForSEO's backlink database.
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- Rogerbot (Moz): Crawls a site for the site audits of a Moz Pro Campaign.
See which bots reach your site, and which of them are who they claim to be.
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