SemrushBot
SemrushBot is an SEO crawler operated by Semrush. It maps link graphs, ranking signals, and on-page audits, usually for a SaaS product that helps marketers monitor their own or competitor sites.
Volume can be heavy. SEO crawlers often request every page on a site, and several can hit you in parallel if multiple customers are auditing your domain at once.
Most are well-behaved, respect robots.txt, and back off when rate-limited. The trade-off for allowing them is being visible inside the marketing tools your customers and competitors use.
See SemrushBot on your own site
Match the User-Agent header on incoming requests against the pattern below.
regex
Known UA examples
example 1
For higher confidence, also verify the source IP against the operator's published ranges. UA strings can be spoofed; IP ownership is harder to fake.
Renders JavaScript
No
IP verification
Published IP ranges
Crawl frequency
Heavy on demand
Honors robots.txt
Yes
Honors Crawl-delay
Yes
Semrush runs 18 bots in total. Each one is a separate user-agent so you can allow or block them independently.
SEO Crawler
16DevOps & Monitoring
1Training Crawler
1Share of AI bot traffic
3.5%
↑ 13% vs 12 mo ago
% of top sites blocking it
13%
↑ 23% vs 12 mo ago
Top page categories crawled
SEO Crawlers as a category, share of all bot traffic
13%
↑ 21% vs 12 mo ago
Sum of every seo crawler we have public stats on. Compare to SemrushBot's individual trend above to see if it's pulling ahead of its category or falling behind.
Crawl-to-click ratio
5,400 : 1
For every 1,000 fetches, this agent sends ~0.19 human visits back. Cloudflare crawl-to-click data
Snapshot updated
2026-04
Connect Agent Analytics for daily, per-site numbers.
Should I let SemrushBot through?
In most cases, yes. Useful to be visible in SEO tooling, but volume can be heavy. Rate-limit to keep the load manageable. If volume gets noisy, rate-limit it before you block it outright.
Does blocking SemrushBot affect my Google rankings?
No. SemrushBot is not a search-engine crawler. Your ranking on Google or Bing is unaffected by what you do here.
How do I confirm a request is really from SemrushBot?
Look at the User-Agent header in your access logs and match it against the strings listed above. Worth knowing that the User-Agent is easy to fake, so this check tells you "the traffic claims to be SemrushBot", not "the traffic is genuinely SemrushBot". If you need stronger guarantees, look for a reverse-DNS check or wait for Semrush to publish IP ranges.
Why is a third-party tool crawling my site?
Someone, possibly a competitor running a backlink audit, possibly your own team, set up a job in Semrush. The crawler runs on their schedule. Blocking it only blocks their visibility into your site, it doesn't break anything user-facing.
How is SemrushBot different from Semrush's other bots?
Semrush splits work across multiple user-agents so site owners can decide on each one independently. Training crawlers, live-fetch agents, search indexers, and agentic browsers each get their own name. Worth scanning the rest of the Semrush family above to see which ones actually matter for your site.
What's the cleanest way to control SemrushBot?
Two layers. Robots.txt for the polite crawlers that read it, and rules at your CDN or edge for the ones that don't. Rankly's Agent Experience handles both from a single config, so you can allow, block, rate-limit, or serve a stripped-down version per bot. Agent Analytics handles the observation half so you know which bots are actually worth a rule.
Verify everything above against the operator's own documentation.