OnCrawl
OnCrawl SEO web crawler for analysis
About this crawler
OnCrawl is a web crawler identified by the regular-expression pattern OnCrawl\/ in the User-Agent request header. It is categorised as seo. Use the regex above to detect, log, allow, or block OnCrawl traffic in your web server, CDN edge rules, or robots.txt.
Block-rate · top 25k sites
0.33%
Technical details
- Name
- OnCrawl
- Pattern
OnCrawl\/- Tags
- seo
- Reference
- https://www.oncrawl.com/
- Added
- 2025/03/27
- rDNS suffixes
.oncrawl.com- Instances
- 2 known sample(s)
rDNS verification (FCrDNS)
Verify a request is genuinely OnCrawl with forward-confirmed reverse DNS: the client IP's PTR record must end in one of the suffixes below and a forward A/AAAA lookup of that hostname must return the same IP. UA strings alone are spoofable; FCrDNS is not.
.oncrawl.com
Sample User-Agent strings
Mozilla/5.0 (compatible; OnCrawl/1.0; +http://www.oncrawl.com)
Mozilla/5.0 (iPhone; CPU iPhone OS 8_3 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12F70 Safari/600.1.4 (compatible; OnCrawl/1.0; +http://www.oncrawl.com)
Block this crawler
robots.txt — disallow OnCrawl:
User-agent: OnCrawl
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} OnCrawl\/ [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "OnCrawl\\/") {
return 403;
}
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