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<form action="" method="post">
  <table border="1" align="center" valign="center">
    <tbody>
      <tr>
        <td>Major network</td>
        <td>
          <input style="width:100%;" type="text" name="majornet" value="" tabindex="1">
        </td>
      </tr>
      <tr>
        <td>Subnets</td>
        <td>
          <table>
            <tbody>
              <tr>
                <td>Name</td>
                <td>Size</td>
              </tr>
              <tr>
                <td><input type="text" name="net_1" value="A" tabindex="8"></td>
                <td><input type="text" name="size_1" value="" tabindex="2"></td>
              </tr>
              <tr>
                <td><input type="text" name="net_2" value="B" tabindex="9"></td>
                <td><input type="text" name="size_2" value="" tabindex="3"></td>
              </tr>
              <tr>
                <td><input type="text" name="net_3" value="C" tabindex="10"></td>
                <td><input type="text" name="size_3" value="" tabindex="4"></td>
              </tr>
              <tr>
                <td><input type="text" name="net_4" value="D" tabindex="11"></td>
                <td><input type="text" name="size_4" value="" tabindex="5"></td>
              </tr>
              <tr>
                <td><input type="text" name="net_5" value="E" tabindex="12"></td>
                <td><input type="text" name="size_5" value="" tabindex="6"></td>
              </tr>
              <tr>
                <td><input type="text" name="net_6" value="F" tabindex="13"></td>
                <td><input type="text" name="size_6" value="" tabindex="7"></td>
              </tr>
              <tr>
                <td colspan="2">Number of subnets: <input type="text" name="netnum" value="6" maxlength="3" size="3" onkeypress="submIfEnter(form,event);" tabindex="14">
                  <input type="button" name="change" value="Change" onclick="form.submit();" tabindex="15">
                </td>
              </tr>
              <tr>
                <td colspan="2"> Sort results by: <select name="sort" tabindex="16">
                    <option value="no">Do not sort</option>
                    <option value="name">name</option>
                    <option selected="" value="size">size</option>
                  </select>
                </td>
              </tr>
            </tbody>
          </table>
        </td>
      </tr>
      <tr>
        <td colspan="2" align="center"><input type="submit" name="subm" value="Submit" style="font-weight:bold;width:120px" tabindex="17"></td>
      </tr>
    </tbody>
  </table>
</form>

Text Content

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VLSM (CIDR) SUBNET CALCULATOR

Variable Length Subnet Masking is a technique that allows network administrators
to divide an IP address space to subnets of different sizes, unlike simple
same-size subnetting. Learn more about VLSM

VLSM Subnet Calculator is intend for automate and simplify VLSM calculation
process.

How to use: Enter major network address and prefix, like 192.168.1.0/24
Enter sizes (number of assignable ip addresses) of subnets to divide major
network. You can specify subnetwork names instead of default.
You can change number of subnets at any time.


Major network Subnets

Name Size Number of subnets: Sort results by: Do not sort name size

References:
 * IP Address Classes
 * Subnet Masks
 * OSI and TCP/IP Network Models
 * Powers of 2
 * Dec-Bin-Hex Conversion

If you have a question/suggestion/bug report, please use Feedback form.

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