MJ12bot/v2.0.5
GoodBotCommunity-sourcedA distributed web crawler operated by Majestic that maps link relationships to power a comprehensive backlink intelligence database. Operated by Majestic-12 Ltd.
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.
Identification
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.
Block or allow MJ12bot/v2.0.5
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: /
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
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Links & references
Data sources
This profile is compiled from the following sources.
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