www.subnet-calculator.com
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URL:
https://www.subnet-calculator.com/
Submission: On April 04 via manual from GB — Scanned from GB
Submission: On April 04 via manual from GB — Scanned from GB
Form analysis 1 forms found in the DOM
Name: calculator — GET rs_subnet.php
<form name="calculator" id="calculator" target="RemoteScripting" action="rs_subnet.php" method="get">
<input type="hidden" name="field_change" id="field_change" value="1">
<table class="calc">
<tbody>
<tr>
<td colspan="2" class="title">
<img src="images/p18.jpg" alt="Subnet Calculator" width="18" height="15" border="0"> <b>Subnet Calculator</b>
</td>
</tr>
<tr>
<td class="left">
<h2 class="element">Network Class</h2><br>
<label> A <input type="radio" id="class_a" name="class_a" value="A" onclick="class_a_click()">
</label>
<label> B <input type="radio" id="class_b" name="class_b" value="B" onclick="class_b_click()">
</label>
<label> C <input type="radio" id="class_c" name="class_c" value="C" onclick="class_c_click()">
</label>
</td>
<td class="right">
<h2 class="element">First Octet Range</h2><br>
<input type="text" id="oct_range" name="oct_range" value="192 - 223" size="20" readonly="" class="calc-output">
</td>
</tr>
<tr>
<td class="left">
<h2 class="element">IP Address</h2><br>
<input type="text" id="ip_addr" name="ip_addr" class="calc-input-addr" value="192.168.0.1" maxlength="15" onchange="valueChange('0');">
</td>
<td class="right">
<h2 class="element">Hex IP Address</h2><br>
<input type="text" id="hex_addr" name="hex_addr" value="" size="20" readonly="" class="calc-output">
</td>
</tr>
<tr>
<td class="left">
<h2 class="element">Subnet Mask</h2><br>
<select id="subnet_mask" name="subnet_mask" onchange="valueChange('1');">
<option value="0">255.255.255.0</option>
<option value="1">255.255.255.128</option>
<option value="2">255.255.255.192</option>
<option value="3">255.255.255.224</option>
<option value="4">255.255.255.240</option>
<option value="5">255.255.255.248</option>
<option value="6">255.255.255.252</option>
</select>
</td>
<td class="right">
<h2 class="element">Wildcard Mask</h2><br>
<input type="text" name="inverted_mask" id="inverted_mask" value="" size="20" readonly="" class="calc-output">
</td>
</tr>
<tr>
<td class="left">
<h2 class="element">Subnet Bits</h2><br>
<select name="subnet_bits" id="subnet_bits" onchange="valueChange('2');">
<option value="0">0</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
</select>
</td>
<td class="right">
<h2 class="element">Mask Bits</h2><br>
<select id="mask_bits" name="mask_bits" size="1" onchange="valueChange('3');">
<option value="0">24</option>
<option value="1">25</option>
<option value="2">26</option>
<option value="3">27</option>
<option value="4">28</option>
<option value="5">29</option>
<option value="6">30</option>
</select>
</td>
</tr>
<tr>
<td class="left">
<h2 class="element">Maximum Subnets</h2><br>
<select id="max_subnets" name="max_subnets" size="1" onchange="valueChange('4');">
<option value="0">1</option>
<option value="1">2</option>
<option value="2">4</option>
<option value="3">8</option>
<option value="4">16</option>
<option value="5">32</option>
<option value="6">64</option>
</select>
</td>
<td class="right">
<h2 class="element">Hosts per Subnet</h2><br>
<select id="max_hosts" name="max_hosts" size="1" onchange="valueChange('5');">
<option value="0">254</option>
<option value="1">126</option>
<option value="2">62</option>
<option value="3">30</option>
<option value="4">14</option>
<option value="5">6</option>
<option value="6">2</option>
</select>
</td>
</tr>
<tr>
<td colspan="2" class="left">
<h2 class="element">Host Address Range</h2><br>
<input type="text" id="host_range" name="host_range" value="" size="30" readonly="" class="calc-output">
</td>
</tr>
<tr>
<td class="left">
<h2 class="element">Subnet ID</h2><br>
<input type="text" id="subnet_id" name="subnet_id" value="" size="20" readonly="" class="calc-output">
</td>
<td class="right">
<h2 class="element">Broadcast Address</h2><br>
<input type="text" id="broadcast_addr" name="broadcast_addr" value="" size="20" readonly="" class="calc-output">
</td>
</tr>
<tr>
<td colspan="2" class="left">
<h2 class="element">Subnet Bitmap</h2><br>
<div id="subnet_bitmap" name="subnet_bitmap" value="" size="40" readonly="" class="calc-output"><span class="red_text">110nnnnn</span>.<span class="red_text">nnnnnnnn</span>.<span class="red_text">nnnnnnnn</span>.<span
class="green_text"></span><span class="green_text">hhhhhhhh</span></div>
</td>
</tr>
<tr>
<td colspan="2"><span class="base"></span></td>
</tr>
</tbody>
</table> <!-- calc -->
</form>Text Content
IP SUBNET CALCULATOR
* Subnets
* CIDR
* Wildcard
IP Subnet Calculator
The IP Subnet Mask Calculator enables subnet network calculations using network
class, IP address, subnet mask, subnet bits, mask bits, maximum required IP
subnets and maximum required hosts per subnet.
Results of the subnet calculation provide the hexadecimal IP address, the
wildcard mask, for use with ACL (Access Control Lists), subnet ID, broadcast
address, the subnet address range for the resulting subnet network and a subnet
bitmap.
For classless supernetting, please use the CIDR Calculator. For classful
supernetting, please use the IP Supernet Calculator. For simple ACL (Access
Control List) wildcard mask calculations, please use the ACL Wildcard Mask
Calculator.
Note:
These online network calculators may be used totally free of charge provided
their use is from this url (www.subnet-calculator.com).
Subnet Calculator
NETWORK CLASS
A B C
FIRST OCTET RANGE
IP ADDRESS
HEX IP ADDRESS
SUBNET MASK
255.255.255.0 255.255.255.128 255.255.255.192 255.255.255.224 255.255.255.240
255.255.255.248 255.255.255.252
WILDCARD MASK
SUBNET BITS
0 1 2 3 4 5 6
MASK BITS
24 25 26 27 28 29 30
MAXIMUM SUBNETS
1 2 4 8 16 32 64
HOSTS PER SUBNET
254 126 62 30 14 6 2
HOST ADDRESS RANGE
SUBNET ID
BROADCAST ADDRESS
SUBNET BITMAP
110nnnnn.nnnnnnnn.nnnnnnnn.hhhhhhhh
* Resources
Notes about the Subnet Calculator
1. The subnet calculator implements a classful / classed IP addressing scheme
where the following rules are adhered to:
* Class A addresses have their first octet in the range 1 to 126 (binary
address begins with 0).
* Class B addresses have their first octet in the range 128 to 191 (binary
address begins with 10).
* Class C addresses have their first octet in the range 192 to 223 (binary
address begins with 110).
2. The subnet calculator allows the use of a single subnet bit - for example, a
class C address with a subnet mask of 255.255.255.128 is permitted.
3. The subnet calculator allows a subnet ID to have its final octet equal to
the final octet of its subnet mask - for example, a class C network address
of 192.168.0.192 with a subnet mask of 255.255.255.192 is permitted.
The above is generally accepted as being 'normal', however, certification
students should keep in mind that, in some certification programs, the final two
points are regarded as inacceptible.
For classless subnetting, you can use the CIDR calculator.
© 2004 - 2023 Clive Porter - All rights reserved.