MJ12bot

Majestic · SEO and backlink crawlers · json

User-agent: MJ12bot
Disallow: /
robots.txt tokenMJ12bot
User-agent containsMJ12bot
OperatorMajestic
CategorySEO and backlink crawlers
robots.txtobeys robots.txt (documented)
Verify byno published verification method

What it is

Majestic's link-graph crawler, run as a distributed community project. Majestic states plainly that it cannot restrict the bot to a fixed set of addresses, and offers a pre-arranged ident string in the request headers instead.

What blocking it costs you

You leave the Majestic backlink index. No search or AI effect. It supports Crawl-delay, which is usually the better answer than a block.

Full user-agent string

Mozilla/5.0 (compatible; MJ12bot/v1.4.8; http://mj12bot.com/)

Allow it instead

User-agent: MJ12bot
Allow: /

Operator documentation: https://mj12bot.com/
Machine copies: json · markdown
Policies that name this crawler: allow-all · block-seo-tools