What is MIME type "application/vnd.noblenet-sealer"?

A MIME type is a string that tells browsers and other tools how to handle a particular kind of file.

The MIME type application/vnd.noblenet-sealer is vendor-specific. It is used for files that have been digitally sealed for integrity and authenticity.

Files of this type are processed by proprietary software that applies a seal to secure the content. The seal may involve cryptographic checks or embedded metadata to ensure the file has not been tampered with.

The format helps systems identify and open the file with the correct application. This reduces errors when sharing or archiving secured data.

• Secured Data Distribution – Ensures only authorized programs can open and verify the file.
• Integrity Verification – Embeds checks to confirm that the content has remained unchanged.
• Proprietary Packaging – Limits file handling to trusted software environments.

Typically, files using this MIME type use the extension NNS. For more on similar formats and MIME types, visit IANA media types.

Associated file extensions

.nns

Usage Examples

HTTP Header

When serving content with this MIME type, set the Content-Type header:

    Content-Type: application/vnd.noblenet-sealer
  

HTML

In HTML, you can specify the MIME type in various elements:

    <a href="file.dat" type="application/vnd.noblenet-sealer">Download file</a>
  

Server-side (Node.js)

Setting the Content-Type header in Node.js:

    const http = require('http');
    
    http.createServer((req, res) => {
      res.setHeader('Content-Type', 'application/vnd.noblenet-sealer');
      res.end('Content here');
    }).listen(3000);
  

Associated file extensions

.nns