<h1 id="network-id">Network ID<a aria-hidden="true" tabindex="-1" href="#network-id"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" height="1em" fill="currentColor"><path d="M280 341.1l-1.2.1c-3.6.4-7 2-9.6 4.5l-64.6 64.6c-13.7 13.7-32 21.2-51.5 21.2s-37.8-7.5-51.5-21.2c-13.7-13.7-21.2-32-21.2-51.5s7.5-37.8 21.2-51.5l68.6-68.6c3.5-3.5 7.3-6.6 11.4-9.3 4.6-3 9.6-5.6 14.8-7.5 4.8-1.8 9.9-3 15-3.7 3.4-.5 6.9-.7 10.2-.7 1.4 0 2.8.1 4.6.2 17.7 1.1 34.4 8.6 46.8 21 7.7 7.7 13.6 17.1 17.1 27.3 2.8 8 11.2 12.5 19.3 10.1.1 0 .2-.1.3-.1.1 0 .2 0 .2-.1 8.1-2.5 12.8-11 10.5-19.1-4.4-15.6-12.2-28.7-24.6-41-15.6-15.6-35.9-25.8-57.6-29.3-1.9-.3-3.8-.6-5.7-.8-3.7-.4-7.4-.6-11.1-.6-2.6 0-5.2.1-7.7.3-5.4.4-10.8 1.2-16.2 2.5-1.1.2-2.1.5-3.2.8-6.7 1.8-13.3 4.2-19.5 7.3-10.3 5.1-19.6 11.7-27.7 19.9l-68.6 68.6C58.9 304.4 48 330.8 48 359c0 28.2 10.9 54.6 30.7 74.4C98.5 453.1 124.9 464 153 464c28.2 0 54.6-10.9 74.4-30.7l65.3-65.3c10.4-10.5 2-28.3-12.7-26.9z"></path><path d="M433.3 78.7C413.5 58.9 387.1 48 359 48s-54.6 10.9-74.4 30.7l-63.7 63.7c-9.7 9.7-3.6 26.3 10.1 27.4 4.7.4 9.3-1.3 12.7-4.6l63.8-63.6c13.7-13.7 32-21.2 51.5-21.2s37.8 7.5 51.5 21.2c13.7 13.7 21.2 32 21.2 51.5s-7.5 37.8-21.2 51.5l-68.6 68.6c-3.5 3.5-7.3 6.6-11.4 9.3-4.6 3-9.6 5.6-14.8 7.5-4.8 1.8-9.9 3-15 3.7-3.4.5-6.9.7-10.2.7-1.4 0-2.9-.1-4.6-.2-17.7-1.1-34.4-8.6-46.8-21-7.3-7.3-12.8-16-16.4-25.5-2.9-7.7-11.1-11.9-19.1-9.8-8.9 2.3-14.1 11.7-11.3 20.5 4.5 14 12.1 25.9 23.7 37.5l.2.2c16.9 16.9 39.4 27.6 63.3 30.1 3.7.4 7.4.6 11.1.6 2.6 0 5.2-.1 7.8-.3 6.5-.5 13-1.6 19.3-3.2 6.7-1.8 13.3-4.2 19.5-7.3 10.3-5.1 19.6-11.7 27.7-19.9l68.6-68.6c19.8-19.8 30.7-46.2 30.7-74.4s-11.1-54.6-30.9-74.4z"></path></svg></a></h1>
<ul>
<li>Calculated by the number of 1 bits are in a <a href="/second-brain/subnet%20mask">subnet mask</a>
<ul>
<li>Example:
<ul>
<li><a href="/second-brain/ip%20address">IP address</a>: <code>192.168.123.132</code>
<ul>
<li>Binary: <code>11000000.10101000.01111011.1000010</code></li>
</ul>
</li>
<li>Subnet mask: <code>255.255.255.0</code>
<ul>
<li>Binary: <code>11111111.111111111.111111111.00000000</code></li>
</ul>
</li>
<li>Network ID: <code>192.168.123.0</code></li>
</ul>
</li>
</ul>
</li>
</ul>
<h2 id="logical-anding-to-calculate-a-network-id">Logical ANDing to Calculate a Network ID<a aria-hidden="true" tabindex="-1" href="#logical-anding-to-calculate-a-network-id"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512" height="1em" fill="currentColor"><path d="M280 341.1l-1.2.1c-3.6.4-7 2-9.6 4.5l-64.6 64.6c-13.7 13.7-32 21.2-51.5 21.2s-37.8-7.5-51.5-21.2c-13.7-13.7-21.2-32-21.2-51.5s7.5-37.8 21.2-51.5l68.6-68.6c3.5-3.5 7.3-6.6 11.4-9.3 4.6-3 9.6-5.6 14.8-7.5 4.8-1.8 9.9-3 15-3.7 3.4-.5 6.9-.7 10.2-.7 1.4 0 2.8.1 4.6.2 17.7 1.1 34.4 8.6 46.8 21 7.7 7.7 13.6 17.1 17.1 27.3 2.8 8 11.2 12.5 19.3 10.1.1 0 .2-.1.3-.1.1 0 .2 0 .2-.1 8.1-2.5 12.8-11 10.5-19.1-4.4-15.6-12.2-28.7-24.6-41-15.6-15.6-35.9-25.8-57.6-29.3-1.9-.3-3.8-.6-5.7-.8-3.7-.4-7.4-.6-11.1-.6-2.6 0-5.2.1-7.7.3-5.4.4-10.8 1.2-16.2 2.5-1.1.2-2.1.5-3.2.8-6.7 1.8-13.3 4.2-19.5 7.3-10.3 5.1-19.6 11.7-27.7 19.9l-68.6 68.6C58.9 304.4 48 330.8 48 359c0 28.2 10.9 54.6 30.7 74.4C98.5 453.1 124.9 464 153 464c28.2 0 54.6-10.9 74.4-30.7l65.3-65.3c10.4-10.5 2-28.3-12.7-26.9z"></path><path d="M433.3 78.7C413.5 58.9 387.1 48 359 48s-54.6 10.9-74.4 30.7l-63.7 63.7c-9.7 9.7-3.6 26.3 10.1 27.4 4.7.4 9.3-1.3 12.7-4.6l63.8-63.6c13.7-13.7 32-21.2 51.5-21.2s37.8 7.5 51.5 21.2c13.7 13.7 21.2 32 21.2 51.5s-7.5 37.8-21.2 51.5l-68.6 68.6c-3.5 3.5-7.3 6.6-11.4 9.3-4.6 3-9.6 5.6-14.8 7.5-4.8 1.8-9.9 3-15 3.7-3.4.5-6.9.7-10.2.7-1.4 0-2.9-.1-4.6-.2-17.7-1.1-34.4-8.6-46.8-21-7.3-7.3-12.8-16-16.4-25.5-2.9-7.7-11.1-11.9-19.1-9.8-8.9 2.3-14.1 11.7-11.3 20.5 4.5 14 12.1 25.9 23.7 37.5l.2.2c16.9 16.9 39.4 27.6 63.3 30.1 3.7.4 7.4.6 11.1.6 2.6 0 5.2-.1 7.8-.3 6.5-.5 13-1.6 19.3-3.2 6.7-1.8 13.3-4.2 19.5-7.3 10.3-5.1 19.6-11.7 27.7-19.9l68.6-68.6c19.8-19.8 30.7-46.2 30.7-74.4s-11.1-54.6-30.9-74.4z"></path></svg></a></h2>
<ul>
<li>Computers combine the bits of a host's <a href="/second-brain/ip%20address">IP address</a> and <a href="/second-brain/subnet%20mask">subnet mask</a> to calculate the network ID</li>
</ul>
<table>
<thead>
<tr>
<th></th>
<th></th>
<th>First Octet</th>
<th>Second Octet</th>
<th>Third Octet</th>
<th>Fourth Octet</th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td></td>
<td><a href="/second-brain/ip%20address">IP Address</a></td>
<td><code>11000000</code></td>
<td><code>00100010</code></td>
<td><code>01011001</code></td>
<td><code>01111111</code></td>
<td><code>192.34.89.127</code></td>
</tr>
<tr>
<td>AND</td>
<td><a href="/second-brain/subnet%20mask">Subnet Mask</a></td>
<td><code>11111111</code></td>
<td><code>11111111</code></td>
<td><code>11111111</code></td>
<td><code>00000000</code></td>
<td><code>255.255.255.0</code></td>
</tr>
<tr>
<td>EQUALS</td>
<td>Network ID</td>
<td><code>11000000</code></td>
<td><code>00100010</code></td>
<td><code>01011001</code></td>
<td><code>00000000</code></td>
<td><code>192.34.89.0</code></td>
</tr>
</tbody>
</table>
<p><a href="/second-brain/networking">Networking</a> <a href="/second-brain/subnetting">Subnetting</a> <a href="/second-brain/ip%20address">IP Address</a></p>

		First Octet	Second Octet	Third Octet	Fourth Octet
	IP Address	`11000000`	`00100010`	`01011001`	`01111111`	`192.34.89.127`
AND	Subnet Mask	`11111111`	`11111111`	`11111111`	`00000000`	`255.255.255.0`
EQUALS	Network ID	`11000000`	`00100010`	`01011001`	`00000000`	`192.34.89.0`