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href="/franco-ip-calculator-assets/DXJuuM-m.js"><link rel="modulepreload" as="script" crossorigin href="/franco-ip-calculator-assets/CXjAaN70.js"><link rel="modulepreload" as="script" crossorigin href="/franco-ip-calculator-assets/DxSaQngR.js"><link rel="modulepreload" as="script" crossorigin href="/franco-ip-calculator-assets/C6K5U3fp.js"><link rel="modulepreload" as="script" crossorigin href="/franco-ip-calculator-assets/DvoAna_0.js"><link rel="modulepreload" as="script" crossorigin href="/franco-ip-calculator-assets/DrtZ0SJr.js"><link rel="modulepreload" as="script" crossorigin href="/franco-ip-calculator-assets/Da3-boAU.js"><link rel="modulepreload" as="script" crossorigin href="/franco-ip-calculator-assets/BmalAMa2.js"><link rel="modulepreload" as="script" crossorigin href="/franco-ip-calculator-assets/agSqhvqn.js"><script type="module" src="/franco-ip-calculator-assets/DXJuuM-m.js" crossorigin></script><meta property="og:type" content="website"><meta property="og:image" 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href="/images/logo/logo_192.png"><link rel="icon" sizes="16x16" type="image/png" href="/images/logo/logo_16.png"><link rel="icon" sizes="32x32" type="image/png" href="/images/logo/logo_32.png"><link rel="icon" sizes="96x96" type="image/png" href="/images/logo/logo_96.png"><script type="application/ld+json" children="{&quot;@context&quot;:&quot;https://schema.org&quot;,&quot;@type&quot;:&quot;Organization&quot;,&quot;url&quot;:&quot;https://www.calcip.com&quot;,&quot;logo&quot;:&quot;https://www.calcip.com/images/logo/logo.svg&quot;}"></script><meta name="description" content="IP Subnet Calculator by Franco For Exams (e.g. CCNA (Cisco Certified Network Associate), CCNP (Cisco Certified Network Professional))"><meta property="og:title" content="IP Subnet Calculator"><meta property="og:url" content="https://www.calcip.com/"><script type="application/ld+json" children="{&quot;@context&quot;:&quot;https://schema.org&quot;,&quot;@type&quot;:&quot;Course&quot;,&quot;name&quot;:&quot;CCNA 國際認可證書課程 (Fast Track)&quot;,&quot;description&quot;:&quot;為了能證明你有專業水準來安裝、設定及管理 Cisco 的網路產品，Cisco 便推出其 CCNA (Cisco Certified Network Associate，Cisco 認可網路夥伴) 國際認可考試。本中心的 CCNA 課程 (Fast Track) 由 Franco Tsang 籌備多時，精心編排。由上堂、溫習、實習、考試研習、做試題至最後考試，均為你度身訂造，作出有系統的編排。務求令你快速地取得認證。&quot;,&quot;provider&quot;:{&quot;@type&quot;:&quot;Organization&quot;,&quot;name&quot;:&quot;Systematic Computer Education Centre&quot;,&quot;sameAs&quot;:&quot;https://www.systematic.com.hk/&quot;}}"></script></head><body><div id="franco-ip-calculator"><div class="DefaultLayoutFlexContainer" data-v-ea0067d8><div data-v-ea0067d8><header data-v-ea0067d8><div class="SiteLogoFlexContainer" data-v-a8f722c5><a aria-current="page" href="/" class="router-link-active router-link-exact-active" data-v-a8f722c5><img src="/images/logo/logo.svg" alt="Website logo" data-v-a8f722c5></a></div><div class="language-switcher" data-v-775459fc><span class="active lang-link" data-v-775459fc>Eng</span><span class="separator" data-v-775459fc>|</span><span class="lang-link" data-v-775459fc>繁</span></div><nav class="NavContainer" data-v-3d19e5f5><div class="ItemContainer" id="ipsubnet" data-v-3d19e5f5><div data-v-3d19e5f5><a aria-current="page" href="/" class="router-link-active router-link-exact-active NavHyperLinkStyle NavActiveClass" data-v-3d19e5f5>IP / Subnet</a></div></div><div class="ItemContainer" id="subnetmask" data-v-3d19e5f5><div data-v-3d19e5f5><a href="/subnet-mask-calculator" class="NavHyperLinkStyle" data-v-3d19e5f5>Subnet mask</a></div></div><div class="ItemContainer" id="summarization" data-v-3d19e5f5><div data-v-3d19e5f5><a href="/route-summarization" class="NavHyperLinkStyle" data-v-3d19e5f5>Summarization</a></div></div><div class="ItemContainer" id="ipv6" data-v-3d19e5f5><div data-v-3d19e5f5><a href="/ipv6" class="NavHyperLinkStyle" data-v-3d19e5f5>IPv6</a></div></div><div class="ItemContainer" id="eui64" data-v-3d19e5f5><div data-v-3d19e5f5><a href="/eui-64" class="NavHyperLinkStyle" data-v-3d19e5f5>EUI-64</a></div></div><div class="ItemContainer" id="ccnaq" data-v-3d19e5f5><div data-v-3d19e5f5><a href="/ccna-exercises-questions" class="NavHyperLinkStyle" data-v-3d19e5f5>CCNA-Q</a></div></div></nav></header><!--[--><main data-v-d0acf507><h1 data-v-d0acf507>IP Subnet Calculator</h1><div class="sticky" data-v-d0acf507><label for="ipStringInput" class="fieldtitle" data-v-d0acf507>IP Address:</label><input id="ipStringInput" type="text" placeholder="192.168.1.1" value="192.168.1.1" data-v-d0acf507><label for="subnetMaskInput" class="fieldtitle" data-v-d0acf507>Subnet mask:</label><div class="RangeInputContainer" data-v-d0acf507><input type="range" min="0" max="32" value="24" id="subnetMaskInput" data-v-d0acf507 data-v-a06f1d6e><div class="PrefixSubnetMaskContainer" data-v-d0acf507><label for="subnetMaskTextInput" data-v-d0acf507>/</label><input id="subnetMaskTextInput" type="text" placeholder="24" value="24" data-v-d0acf507></div><div id="subnetMaskDecimal" data-v-d0acf507>255.255.255.0</div></div><!----><!----><!----><!----><!----><!----></div><div data-v-d0acf507><div class="CalculationResultContainer" data-v-d0acf507 style="--v1defa7de:15;" data-v-131d5c58><span data-v-131d5c58></span></div></div><div class="CCNACourse" data-v-d0acf507 data-v-725994c0>* Concepts of IP addressing, subnetting, VLSM (Variable Length Subnet Mask), route summarization, IPv6, EUI-64 (Extended Unique Identifier-64) and relevant exam tips, are covered in our <a href="https://www.systematic.com.hk/ccna-fast-course-training.htm" rel="noopener noreferrer" class="UnderLineHyperLink" data-v-725994c0>CCNA (Cisco Certified Network Associate) course</a>.</div></main><!--]--><footer data-v-ea0067d8><div class="copyright" data-v-d0030dca>Copyright © 2023 <a href="https://www.systematic.com.hk/course_Franco.htm" rel="noopener noreferrer" class="UnderLineHyperLink" data-v-d0030dca>Franco</a> @ <a href="https://www.systematic.com.hk" rel="noopener noreferrer" 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