SISTRIX Crawler user agent
Operated by SISTRIX
SISTRIX Crawler is the crawler of the SISTRIX SEO toolbox, used for site audits in the SISTRIX Optimizer.
The SISTRIX Crawler bot at a glance
- SISTRIX Crawler is operated by SISTRIX and fetches pages to power a specific product feature.
- The robots.txt token for SISTRIX Crawler is SISTRIX.
- Blocking an SEO tool crawler has no effect on Google or Bing rankings.
- SISTRIX Crawler robots.txt support: Not documented.
- Recommendation for Generative Engine Optimization (GEO): Your choice.
What is SISTRIX Crawler?
SISTRIX Crawler visits sites that SISTRIX users analyze.
Its former documentation host no longer resolves.
Should you block SISTRIX Crawler?
Blocking SISTRIX Crawler is a business decision: it protects your content but can lower how well AI products know your brand.
| Effect on search rankings | Blocking an SEO tool crawler has no effect on Google or Bing rankings. |
|---|---|
| Effect on AI visibility | No effect on AI answers. Blocking hides your pages and backlinks from that SEO tool, including from competitors who use it, and breaks your own audits in that tool. |
| Follows robots.txt | Not documented |
| Recommendation | Your choice |
How to block or allow SISTRIX Crawler
Put the robots.txt rule in the file at the root of every domain and subdomain, for example https://example.com/robots.txt. The token SISTRIX is matched case-insensitively. robots.txt alone may not stop SISTRIX Crawler, so add the Nginx, Apache or Cloudflare rule as well.
robots.txt: block
# Block SISTRIX Crawler
User-agent: SISTRIX
Disallow: /robots.txt: allow
# Allow SISTRIX Crawler
User-agent: SISTRIX
Allow: /robots.txt: partial
# Keep SISTRIX Crawler out of private areas only
User-agent: SISTRIX
Disallow: /wp-admin/
Disallow: /cart/
Disallow: /checkout/
Disallow: /my-account/
Allow: /Nginx
# Nginx: return 403 to SISTRIX Crawler
if ($http_user_agent ~* "(SISTRIX)") {
return 403;
}Apache
# Apache .htaccess: return 403 to SISTRIX Crawler
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} (SISTRIX) [NC]
RewriteRule .* - [F,L]Cloudflare WAF
# Cloudflare > Security > WAF > Custom rule, action: Block
(http.user_agent contains "SISTRIX")How to verify real SISTRIX Crawler traffic
SISTRIX publishes no IP list or reverse DNS pattern for SISTRIX Crawler, so the user agent cannot be verified. Anyone can send the same string. Rate-limit unusual volume instead of trusting the name.
How to find SISTRIX Crawler in your server logs
Search the web server access log for the token. The command below counts SISTRIX Crawler requests per URL on Nginx or Apache.
grep -i "SISTRIX" access.log | awk '{print $7}' | sort | uniq -c | sort -rn | head -20For a full report per AI bot, upload the log to the AI Log File Analyzer, a free tool by Justin Hà.
SISTRIX Crawler user agent string
The full user agent SISTRIX publishes for SISTRIX Crawler. Version numbers such as Chrome/W.X.Y.Z change over time, so match the token, not the whole string.
Mozilla/5.0 (compatible; SISTRIX Crawler; http://crawler.sistrix.net/)SISTRIX Crawler FAQ
SISTRIX Crawler identifies itself with the robots.txt token "SISTRIX". A typical request header reads: Mozilla/5.0 (compatible; SISTRIX Crawler; http://crawler.sistrix.net/)
SISTRIX has not documented how SISTRIX Crawler treats robots.txt. Add a robots.txt rule and back it with a server rule if the traffic matters to you.
Blocking an SEO tool crawler has no effect on Google or Bing rankings. No effect on AI answers. Blocking hides your pages and backlinks from that SEO tool, including from competitors who use it, and breaks your own audits in that tool.
Add two lines to the robots.txt file at the root of each domain and subdomain: "User-agent: SISTRIX" followed by "Disallow: /". The token is case-insensitive. Changes can take up to 24 hours to be picked up.
Not reliably. SISTRIX publishes no IP list or reverse DNS pattern for SISTRIX Crawler, so anyone can send the same user agent. Rate-limit unusual volume instead of trusting the name.
Search your server access log for "SISTRIX", for example with: grep -i "SISTRIX" access.log. The AI Log File Analyzer by Justin Hà counts visits per AI bot from an uploaded log file.
Sources: Public bot registry. Last reviewed by Justin Hà.
See which of these bots actually reach your website
The AI Log File Analyzer by Justin Hà counts visits from GPTBot, ClaudeBot, PerplexityBot and other AI crawlers in your server log, for free. The GEO Technical Package sets up robots.txt, llms.txt and crawler access for AI search.
