OhDear
Website monitoring bot scanning uptime and TLS certificate validity
About this crawler
OhDear is a web crawler identified by the regular-expression pattern OhDear\/ in the User-Agent request header. It is categorised as monitoring. Use the regex above to detect, log, allow, or block OhDear traffic in your web server, CDN edge rules, or robots.txt.
Block-rate · top 25k sites
No block-rate data for this crawler.
Technical details
- Name
- OhDear
- Pattern
OhDear\/- Tags
- monitoring
- Reference
- https://ohdear.app/docs/faq/what-is-the-oh-dear-crawler-doing-in-my-logs
- Added
- 2026/04/17
- Instances
- 1 known sample(s)
Sample User-Agent strings
Mozilla/5.0 (compatible; OhDear/1.1; +https://ohdear.app/checkerOhDear.app (+https://ohdear.app/docs/checks/uptime)
Block this crawler
robots.txt — disallow OhDear:
User-agent: OhDear
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} OhDear\/ [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "OhDear\\/") {
return 403;
}
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