 <a class="link" href="ip__network_v4/is_subnet_of.html" title="ip::network_v4::is_subnet_of"><span class="bold"><strong>is_subnet_of</strong></span></a>
                </p>
              </td>
<td>
                <p>
                  Test if a network is a real subnet of another network.
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <a class="link" href="ip__network_v4/netmask.html" title="ip::network_v4::netmask"><span class="bold"><strong>netmask</stron