How to block search engines from finding sub.domains? [closed]

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I want to block search engines like Google and Yahoo from crawling user sub.domains like user.example.com, how can i do it?

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Use robots.txt file in your web server.

So, in your subdomain put a robots.txt file that looks like this:

User-agent: *
Disallow: /

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All sites have something specifically specified because that's what they don't want crawled by search engines...