<p>I have a H-4 visa, and it's asking me for my visa number, but I don't know what it's referring to.</p>
<p>According to [this</a> website](<a href=“http://www.immihelp.com/visas/sample-usa-non-immigrant-visa.html]this”>Sample U.S.A. Non-Immigrant Visa - Immihelp), the visa number is the number printed in red ink in the bottom right-hand corner of your visa foil.</p>