Tumblr
Tumblr social blogging platform crawler fetching link previews
About this crawler
Tumblr is a web crawler identified by the regular-expression pattern Tumblr\/ in the User-Agent request header. It is categorised as social-preview. Use the regex above to detect, log, allow, or block Tumblr traffic in your web server, CDN edge rules, or robots.txt.
Block-rate · top 25k sites
0.065%
Technical details
- Name
- Tumblr
- Pattern
Tumblr\/- Tags
- social-preview
- Reference
- https://automattic.com/
- Added
- 2026/04/17
- rDNS suffixes
.tumblr.com- Instances
- 1 known sample(s)
rDNS verification (FCrDNS)
Verify a request is genuinely Tumblr 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.
.tumblr.com
Sample User-Agent strings
Tumblr/14.0.835.186
Block this crawler
robots.txt — disallow Tumblr:
User-agent: Tumblr
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} Tumblr\/ [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "Tumblr\\/") {
return 403;
}
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