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MJ

MJ12bot/v2.0.5

GoodBotCommunity-sourced

A distributed web crawler operated by Majestic that maps link relationships to power a comprehensive backlink intelligence database. Operated by Majestic-12 Ltd.

GoodBot
Assessment
SEO
Category
Bot
Kind
1
Data sources
AI-generated summary, drawn from Cloudflare, operator docs, and community data

What is MJ12bot/v2.0.5?

MJ12bot is the primary crawler for Majestic, a UK-based search intelligence company that specializes in mapping the link structure of the internet. Unlike general-purpose search engines, its primary objective is to build a massive, public-facing index of backlinks, which is used by SEO professionals and businesses to analyze site authority and link equity. The bot operates using a distributed architecture, leveraging a network of broadband connections to efficiently traverse the web while maintaining transparency through its official website.

Helpful — It is a well-documented, respectful crawler that adheres to robots.txt and provides value to webmasters by indexing link data for SEO analysis.

Identification

Bot name
MJ12bot/v2.0.5
Operator
Majestic-12 Ltd
Category
SEO
Verification
Community-sourced
User-agent string
Mozilla/5.0 (compatible; MJ12bot/v2.0.5; http://mj12bot.com/)
Main use cases
Backlink analysisSEO researchLink graph mapping

Why it crawls your site

The bot crawls the web to populate the Majestic Site Explorer, a tool that provides deep insights into how websites are connected via hyperlinks. By following links across the web, it builds a comprehensive 'map' of the internet's link graph, which helps users understand their own backlink profiles and competitive landscape. It respects standard web protocols, including robots.txt and crawl-delay directives, and provides a dedicated portal for site owners to verify its activity and understand its purpose.

IP ranges

Requests from MJ12bot/v2.0.5 originate from these published ranges. For strict verification, match the source IP against this list in addition to checking the user-agent and reverse-DNS.

Showing 24 of 65 ranges

Block or allow MJ12bot/v2.0.5

Block it

Add a Disallow rule for Mozilla/5.0 (compatible; MJ12bot/v2.0.5; http://mj12bot.com/) in your robots.txt file. You can also block at the server level using your web server configuration or CDN firewall rules to filter requests matching the user-agent string.

# Block MJ12bot/v2.0.5 from crawling your entire site
User-agent: Mozilla/5.0 (compatible; MJ12bot/v2.0.5; http://mj12bot.com/)
Disallow: /

# Allow MJ12bot/v2.0.5 full access
User-agent: Mozilla/5.0 (compatible; MJ12bot/v2.0.5; http://mj12bot.com/)
Allow: /
Allow & verify

Ensure your robots.txt allows Mozilla/5.0 (compatible; MJ12bot/v2.0.5; http://mj12bot.com/). Verify requests by checking the user-agent string.

Traffic & trends

Cloudflare Radar traffic

No Cloudflare traffic data available.

Google Trends interest

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Related bots

Other crawlers operated by Majestic-12 Ltd.

Data sources

This profile is compiled from the following sources.

CrawlersDatabase
Last updated September 22, 2026

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