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Use Curl to Fetch ASP.NET Version Banner | The version of ASP.NET is sent in a banner with http requests and can be viewed with a curl command. I’ll show you how! X-AspNet-Version: 2.0.50727 To view this with curl, use tack capital I and fetch any url ending in .aspx. A random url ending in .aspx works as well: $ curl -I 10.112.12.67/asdfsaf.aspx