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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">ShieldsUP</span></span>
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<p><b>ShieldsUP</b> is an online <a href="TCP_and_UDP_port" class="mw-redirect" title="TCP and UDP port">port</a> scanning service created by <a href="Steve_Gibson_(computer_programmer)" title="Steve Gibson (computer programmer)">Steve Gibson</a> of <a href="Gibson_Research_Corporation" class="mw-redirect" title="Gibson Research Corporation">Gibson Research Corporation</a>. The purpose of the utility is to alert the users of any ports that have been opened through their <a href="Firewall_(networking)" class="mw-redirect" title="Firewall (networking)">firewalls</a> or through their <a href="Network_address_translation" title="Network address translation">NAT routers</a>, which can be used by malicious users to take advantage of security vulnerabilities. The utility scans the most common <a href="File_sharing" title="File sharing">file sharing</a> ports, as well as all <a href="List_of_TCP_and_UDP_port_numbers" title="List of TCP and UDP port numbers">service ports</a> (1–1056), and user defined ports, in sets of 64.<sup id="cite_ref-:0_1-0" class="reference"><a href="#cite_note-:0-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
</p><p>It is often recommended for checking port vulnerabilities.<sup id="cite_ref-:0_1-1" class="reference"><a href="#cite_note-:0-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup>
</p><p>The scanning servers have the static <a href="IP_address" title="IP address">IP addresses</a> of 4.79.142.192 to 4.79.142.207.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup>
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<div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2></div>
<ul><li><a href="DShield" title="DShield">DShield</a></li></ul>
<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
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<li id="cite_note-:0-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-:0_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-:0_1-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">
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</style><cite id="CITEREFHo2010" class="citation news cs1">Ho, Erica (April 7, 2010). <a rel="nofollow" class="external text" href="https://lifehacker.com/5511734/shieldsup-tests-your-firewall-for-vulnerabilities">"ShieldsUP Tests Your Firewall for Vulnerabilities"</a>. <i><a href="Lifehacker" title="Lifehacker">Lifehacker</a></i><span class="reference-accessdate">. Retrieved <span class="nowrap">December 13,</span> 2018</span>.</cite></span>
</li>
<li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><cite id="CITEREFHorowitz2014" class="citation news cs1">Horowitz, Michael (January 27, 2014). <a rel="nofollow" class="external text" href="https://www.computerworld.com/article/2475727/network-security/how-and-why-to-check-port-32764-on-your-router.html">"How and why to check port 32764 on your router"</a>. <i><a href="Computerworld" title="Computerworld">Computerworld</a></i><span class="reference-accessdate">. Retrieved <span class="nowrap">December 13,</span> 2018</span>.</cite></span>
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<li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><cite id="CITEREFEllison2006" class="citation news cs1">Ellison, Craig (March 15, 2006). <a rel="nofollow" class="external text" href="https://www.pcmag.com/article2/0,2817,1936149,00.asp">"For Home Networkers"</a>. <i><a href="PC_Magazine" class="mw-redirect" title="PC Magazine">PC Magazine</a></i><span class="reference-accessdate">. Retrieved <span class="nowrap">December 13,</span> 2018</span>.</cite></span>
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<li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><cite id="CITEREFO'Donnell2018" class="citation news cs1">O'Donnell, Andy (October 24, 2018). <a rel="nofollow" class="external text" href="https://www.lifewire.com/how-to-test-your-firewall-2487969">"How to Test Your Firewall"</a>. <i><a href="Lifewire" title="Lifewire">Lifewire</a></i><span class="reference-accessdate">. Retrieved <span class="nowrap">December 13,</span> 2018</span>.</cite></span>
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<li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><cite id="CITEREFGibson" class="citation web cs1">Gibson, Steve. <a rel="nofollow" class="external text" href="https://www.grc.com/shieldsup">"ShieldsUP! — Internet Vulnerability Profiling"</a>. <i><a href="Gibson_Research_Corporation" class="mw-redirect" title="Gibson Research Corporation">Gibson Research Corporation</a></i><span class="reference-accessdate">. Retrieved <span class="nowrap">December 13,</span> 2018</span>.</cite></span>
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<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>
<ul><li><span class="official-website"><span class="url"><a rel="nofollow" class="external text" href="https://www.grc.com/shieldsup">Official website</a></span></span></li></ul>
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