SEO tools · Semrush

SemrushBot

Builds Semrush’s backlink and site audit data. Blocking it does not affect search engines.

Operator: Semrush
Purpose: Backlink & SEO index. Crawlers behind backlink and SEO tools. Many sites block them to save bandwidth; it has no effect on search.
robots.txt token: SemrushBot
User agent: Mozilla/5.0 (compatible; SemrushBot/7~bl; +http://www.semrush.com/bot.html)
Documentation: www.semrush.com/bot/

Block SemrushBot

Add a group naming it to /robots.txt. Compliant crawlers stop before requesting any page. A firewall rule on the user agent is the only way to enforce it against crawlers that ignore robots.txt.

User-agent: SemrushBot
Disallow: /

Allow SemrushBot when everything else is blocked

A group naming the bot wins over User-agent: *, so an explicit allow lets it in while your catch-all rules stay in place.

User-agent: SemrushBot
Allow: /

User-agent: *
Disallow: /

Does SemrushBot reach your site?

The checker applies your robots.txt the way SemrushBot does, then requests your page with the user agent above, alongside 29 other bots.

Other seo tools: AhrefsBot, MJ12bot, DotBot.

Build a complete file with the robots.txt generator.