CloudFlare-AlwaysOnline
CloudFlare always online web crawler
About this crawler
CloudFlare-AlwaysOnline is a web crawler identified by the regular-expression pattern CloudFlare-AlwaysOnline in the User-Agent request header. It is categorised as monitoring. Use the regex above to detect, log, allow, or block CloudFlare-AlwaysOnline traffic in your web server, CDN edge rules, or robots.txt.
Block-rate · top 25k sites
0.20%
Technical details
- Name
- CloudFlare-AlwaysOnline
- Pattern
CloudFlare-AlwaysOnline- Tags
- monitoring
- Reference
- https://www.cloudflare.com/always-online/
- Added
- 2018/09/27
- rDNS suffixes
.cloudflare.com- Instances
- 2 known sample(s)
rDNS verification (FCrDNS)
Verify a request is genuinely CloudFlare-AlwaysOnline 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.
.cloudflare.com
Sample User-Agent strings
Mozilla/5.0 (compatible; CloudFlare-AlwaysOnline/1.0; +http://www.cloudflare.com/always-online) AppleWebKit/534.34
Mozilla/5.0 (compatible; CloudFlare-AlwaysOnline/1.0; +https://www.cloudflare.com/always-online) AppleWebKit/534.34
Block this crawler
robots.txt — disallow CloudFlare-AlwaysOnline:
User-agent: CloudFlare-AlwaysOnline
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} CloudFlare-AlwaysOnline [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "CloudFlare-AlwaysOnline") {
return 403;
}
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