MicrosoftPreview
Microsoft preview web crawler bot
About this crawler
MicrosoftPreview is a web crawler identified by the regular-expression pattern MicrosoftPreview\/ in the User-Agent request header. It is categorised as social-preview. Use the regex above to detect, log, allow, or block MicrosoftPreview 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
- MicrosoftPreview
- Pattern
MicrosoftPreview\/- Tags
- social-preview
- Reference
- https://www.bing.com/webmasters/help/which-crawlers-does-bing-use-8c184ec0
- Added
- 2025/02/11
- rDNS suffixes
.search.msn.com- Instances
- 1 known sample(s)
rDNS verification (FCrDNS)
Verify a request is genuinely MicrosoftPreview 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.
.search.msn.com
Sample User-Agent strings
MicrosoftPreview/2.0; +https://aka.ms/MicrosoftPreview
Block this crawler
robots.txt — disallow MicrosoftPreview:
User-agent: MicrosoftPreview
Disallow: /
Apache .htaccess — return 403:
RewriteEngine On
RewriteCond %{HTTP_USER_AGENT} MicrosoftPreview\/ [NC]
RewriteRule .* - [F,L]
Nginx — return 403 inside a server block:
if ($http_user_agent ~* "MicrosoftPreview\\/") {
return 403;
}
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