AI crawlers · SEO and research crawlers
SemrushBot
SemrushBot is the tool or developer fetch run by Semrush: Semrush crawler. Its operator publishes no IP ranges or DNS names for it, so a request carrying this name cannot be verified. Treat the name in a log line as a claim.
| User-agent token | SemrushBot |
| Operator | Semrush |
| What it does | Semrush crawler |
| Kind | tool or developer fetch |
| Can a request be verified? | No — user agent string only |
| In a CrawlCheck scan | Read from robots.txt; reported, never scored |
Allow or block it in robots.txt
User-agent: SemrushBot Disallow: /
User-agent: SemrushBot Allow: /
Add a group that names it: "User-agent: SemrushBot" followed by "Disallow: /". A crawler follows only the most specific group that names it, so once a group names SemrushBot, rules under "User-agent: *" no longer apply to it; repeat in that group any Disallow lines you still want.
What blocking it changes
No. It is a third-party tool's crawler. Blocking it changes what that tool knows about your site, not anyone's AI answers.
Other agents from Semrush
SemrushBot-OCOB— Semrush AI corpus
See what SemrushBot and every other named agent receive from your own site: run a free scan. The full catalogue is on AI crawlers and as JSON at /ai-crawlers.json.