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<!DOCTYPE html>
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  <title>IP Address Tools — Mario's Cyber Toolkit</title>
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      <div class="page-title fade-in fade-in-1">
        <p class="eyebrow">// tool — 03</p>
        <h1>IP Address Tools</h1>
        <p>Subnet calculator and CIDR ↔ mask converter. All calculations run client-side instantly.</p>
      </div>

      <!-- CIDR ↔ Mask Converter -->
      <div class="card fade-in fade-in-2">
        <div class="card-header">
          <h2>↔ Subnet Mask / CIDR Converter</h2>
          <p>Enter a CIDR prefix (e.g. <code>/24</code>) to get the dotted-decimal mask, or enter a mask (e.g. <code>255.255.255.0</code>) to get CIDR.</p>
        </div>

        <div class="form-group">
          <label class="form-label" for="maskInput">CIDR or Subnet Mask</label>
          <input type="text" id="maskInput" placeholder="/24  or  255.255.255.0" autocomplete="off" />
        </div>

        <div class="row mt-8">
          <button class="btn btn-primary" onclick="convertMask()">Convert</button>
        </div>

        <div class="output-box mt-14" id="maskOutput">Result will appear here…</div>
      </div>

      <hr class="section-rule">

      <!-- Subnet Calculator -->
      <div class="card fade-in fade-in-3">
        <div class="card-header">
          <h2>🌐 Subnet Calculator</h2>
          <p>Enter an IPv4 address and subnet mask to calculate network details.</p>
        </div>

        <div class="form-row">
          <div class="form-group">
            <label class="form-label" for="ipAddress">IP Address</label>
            <input type="text" id="ipAddress" placeholder="192.168.1.10" autocomplete="off" />
          </div>
          <div class="form-group">
            <label class="form-label" for="subnetMask">Subnet Mask</label>
            <input type="text" id="subnetMask" placeholder="/24  or  255.255.255.0" autocomplete="off" />
          </div>
        </div>

        <div class="row mt-8">
          <button class="btn btn-primary" onclick="calculateSubnet()">Calculate</button>
        </div>

        <div class="output-box mt-14" id="subnetOutput">Enter an IP and mask, then click Calculate.</div>
      </div>

      <!-- Quick reference -->
      <div class="card fade-in fade-in-4" style="background:rgba(0,119,204,0.03);">
        <h3 class="mono text-accent" style="font-size:14px; margin-bottom:12px;">📋 Common Subnet Masks</h3>
        <table class="result-table">
          <tr><td>CIDR</td><td>Mask</td></tr>
          <tr><td>/8</td><td>255.0.0.0</td></tr>
          <tr><td>/16</td><td>255.255.0.0</td></tr>
          <tr><td>/24</td><td>255.255.255.0</td></tr>
          <tr><td>/25</td><td>255.255.255.128</td></tr>
          <tr><td>/26</td><td>255.255.255.192</td></tr>
          <tr><td>/27</td><td>255.255.255.224</td></tr>
          <tr><td>/28</td><td>255.255.255.240</td></tr>
          <tr><td>/30</td><td>255.255.255.252</td></tr>
        </table>
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