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subnets.html
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<!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<head>
<title>Subnet Calculator</title>
<link rel="stylesheet" href="subnets.css">
<link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet"
integrity="sha384-9ndCyUaIbzAi2FUVXJi0CjmCapSmO7SnpJef0486qhLnuZ2cdeRhO02iuK6FUUVM" crossorigin="anonymous">
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js"
integrity="sha384-geWF76RCwLtnZ8qwWowPQNguL3RmwHVBC9FhGdlKrxdiJJigb/j/68SIy3Te4Bkz"
crossorigin="anonymous"></script>
<link href="img/pd_icon_32x32px.png" rel="shortcut icon" type="image/x-icon">
<link href="img/pd_icon_256x256.png" rel="apple-touch-icon">
<script language="javascript" type="text/javascript">
var visibleColumns = {
subnet: true,
netmask: false,
range: true,
useable: true,
hosts: true,
divide: true,
join: true,
};
var curNetwork = 0;
var curMask = 0;
function updateNetwork() {
var newNetworkStr = document.forms['calc'].elements['network'].value;
var newMask = parseInt(document.forms['calc'].elements['netbits'].value);
var newNetwork = inet_aton(newNetworkStr);
if (newNetwork === null) {
alert('Invalid network address entered');
return;
}
var tmpNetwork = network_address(newNetwork, newMask);
if (newNetwork != tmpNetwork) {
alert('The network address entered is not on a network boundary for this mask.\nIt has been changed to ' + inet_ntoa(tmpNetwork) + '.');
newNetwork = tmpNetwork;
document.forms['calc'].elements['network'].value = inet_ntoa(tmpNetwork);
}
if (newMask < 0 || newMask > 32) {
alert('The network mask you have entered is invalid');
return;
}
if (curMask == 0) {
curMask = newMask;
curNetwork = newNetwork;
startOver();
}
else if (curMask != newMask && confirm('You are changing the base network from /' + curMask + ' to /' + newMask + '. This will reset any changes you have made. Proceed?')) {
curMask = newMask;
curNetwork = newNetwork;
startOver();
}
else {
document.forms['calc'].elements['netbits'].value = curMask;
curNetwork = newNetwork;
recreateTables();
}
}
function startOver() {
rootSubnet = [0, 0, null];
recreateTables();
}
function recreateTables() {
// Update header visibility
for (const name in visibleColumns) {
console.log(name)
document.getElementById(name + 'Header').style.display = visibleColumns[name] ? 'table-cell' : 'none';
}
var calcbody = document.getElementById('calcbody');
if (!calcbody) {
alert('Body not found');
return;
}
while (calcbody.hasChildNodes()) {
calcbody.removeChild(calcbody.firstChild);
}
updateNumChildren(rootSubnet);
updateDepthChildren(rootSubnet);
createRow(calcbody, rootSubnet, curNetwork, curMask, [curMask, rootSubnet[1], rootSubnet], rootSubnet[0]);
document.getElementById('joinHeader').colSpan = (rootSubnet[0] > 0 ? rootSubnet[0] : 1);
/* Create the bookmark hyperlink */
var link = document.getElementById('saveLink');
if (link) {
link.href = 'subnets.html?network=' + inet_ntoa(curNetwork) + '&mask=' + curMask + '&division=' + binToAscii(nodeToString(rootSubnet));
}
}
function nodeToString(node) {
if (node[2]) {
return '1' + nodeToString(node[2][0]) + nodeToString(node[2][1]);
}
else {
return '0';
}
}
function binToAscii(str) {
var curOut = '';
var curBit = 0;
var curChar = 0;
for (var i = 0; i < str.length; i++) {
if (str.charAt(i) == '1') {
curChar |= 1 << curBit;
}
curBit++;
if (curBit > 3) {
curOut += curChar.toString(16);
curChar = 0;
curBit = 0;
}
}
if (curBit > 0) {
curOut += curChar.toString(16);
}
return str.length + '.' + curOut;
}
function asciiToBin(str) {
var re = /([0-9]+)\.([0-9a-f]+)/;
var res = re.exec(str);
var len = res[1];
var encoded = res[2];
var out = '';
for (var i = 0; i < res[1]; i++) {
var ch = parseInt(res[2].charAt(Math.floor(i / 4)), 16);
var pos = i % 4;
out += (ch & (1 << pos) ? '1' : '0');
}
return out;
}
function createRow(calcbody, node, address, mask, labels, depth) {
if (node[2]) {
var newlabels = labels;
newlabels.push(mask + 1);
newlabels.push(node[2][0][1]);
newlabels.push(node[2][0]);
createRow(calcbody, node[2][0], address, mask + 1, newlabels, depth - 1);
newlabels = new Array();
newlabels.push(mask + 1);
newlabels.push(node[2][1][1]);
newlabels.push(node[2][1]);
createRow(calcbody, node[2][1], address + subnet_addresses(mask + 1), mask + 1, newlabels, depth - 1);
}
else {
var newRow = document.createElement('TR');
calcbody.appendChild(newRow);
/* subnet address */
if (visibleColumns.subnet) {
var newCell = document.createElement('TD');
newCell.appendChild(document.createTextNode(inet_ntoa(address) + '/' + mask));
newRow.appendChild(newCell);
}
var addressFirst = address;
var addressLast = subnet_last_address(address, mask);
var useableFirst = address + 1;
var useableLast = addressLast - 1;
var numHosts;
var addressRange;
var usaebleRange;
if (mask == 32) {
addressRange = inet_ntoa(addressFirst);
useableRange = addressRange;
numHosts = 1;
}
else {
addressRange = inet_ntoa(addressFirst) + ' - ' + inet_ntoa(addressLast);
if (mask == 31) {
useableRange = addressRange;
numHosts = 2;
}
else {
useableRange = inet_ntoa(useableFirst) + ' - ' + inet_ntoa(useableLast);
numHosts = (1 + useableLast - useableFirst);
}
}
/* netmask */
if (visibleColumns.netmask) {
var newCell = document.createElement('TD');
newCell.appendChild(document.createTextNode(inet_ntoa(subnet_netmask(mask))));
newRow.appendChild(newCell);
}
/* range of addresses */
if (visibleColumns.range) {
var newCell = document.createElement('TD');
newCell.appendChild(document.createTextNode(addressRange));
newRow.appendChild(newCell);
}
/* useable addresses */
if (visibleColumns.useable) {
var newCell = document.createElement('TD');
newCell.appendChild(document.createTextNode(useableRange));
newRow.appendChild(newCell);
}
/* Hosts */
if (visibleColumns.hosts) {
var newCell = document.createElement('TD');
newCell.appendChild(document.createTextNode(numHosts));
newRow.appendChild(newCell);
}
/* actions */
if (visibleColumns.divide) {
var newCell = document.createElement('TD');
newRow.appendChild(newCell);
newCell.classList.add('hiddenFromCopy');
if (mask == 32) {
var newLink = document.createElement('SPAN');
newLink.className = 'disabledAction';
newLink.appendChild(document.createTextNode('Divide'));
newCell.appendChild(newLink);
}
else {
var newLink = document.createElement('A');
newLink.href = '#';
newLink.onclick = function () { divide(node); return false; }
newLink.appendChild(document.createTextNode('Divide'));
newCell.appendChild(newLink);
}
}
if (visibleColumns.join) {
var colspan = depth - node[0];
for (var i = (labels.length / 3) - 1; i >= 0; i--) {
var mask = labels[i * 3];
var rowspan = labels[(i * 3) + 1];
var joinnode = labels[(i * 3) + 2];
var newCell = document.createElement('TD');
newCell.rowSpan = (rowspan > 1 ? rowspan : 1);
newCell.colSpan = (colspan > 1 ? colspan : 1);
newCell.classList.add('hiddenFromCopy');
if (i == (labels.length / 3) - 1) {
newCell.classList.add('maskSpan');
}
else {
newCell.classList.add('maskSpanJoinable');
newCell.onclick = newJoin(joinnode);
}
var newSpan = document.createElement('SPAN');
newSpan.innerHTML = '/' + mask;
newSpan.classList.add('global-mask');
newCell.appendChild(newSpan);
newRow.appendChild(newCell);
colspan = 1; // reset for subsequent cells
}
}
}
}
/* This is necessary because 'joinnode' changes during the scope of the caller */
function newJoin(joinnode) {
return function () { join(joinnode) };
}
function divide(node) {
node[2] = new Array();
node[2][0] = [0, 0, null];
node[2][1] = [0, 0, null];
recreateTables();
}
function join(node) {
/* easy as pie */
node[2] = null;
recreateTables();
}
function updateNumChildren(node) {
if (node[2] == null) {
node[1] = 0;
return 1;
}
else {
node[1] = updateNumChildren(node[2][0]) + updateNumChildren(node[2][1]);
return node[1];
}
}
function updateDepthChildren(node) {
if (node[2] == null) {
node[0] = 0;
return 1;
}
else {
node[0] = updateDepthChildren(node[2][0]) + updateDepthChildren(node[2][1]);
return node[1];
}
}
var rootSubnet;
// each node is Array:
// [0] => depth of children, total number of visible children, children
function inet_ntoa(addrint) {
return ((addrint >> 24) & 0xff) + '.' +
((addrint >> 16) & 0xff) + '.' +
((addrint >> 8) & 0xff) + '.' +
(addrint & 0xff);
}
function inet_aton(addrstr) {
var re = /^([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$/;
var res = re.exec(addrstr);
if (res === null) {
return null;
}
for (var i = 1; i <= 4; i++) {
if (res[i] < 0 || res[i] > 255) {
return null;
}
}
return (res[1] << 24) | (res[2] << 16) | (res[3] << 8) | res[4];
}
function network_address(ip, mask) {
var maskbits = 0;
for (var i = 31 - mask; i >= 0; i--) {
ip &= ~1 << i;
}
return ip;
}
function subnet_addresses(mask) {
return 2 ** (32 - mask);
}
function subnet_last_address(subnet, mask) {
return subnet + subnet_addresses(mask) - 1;
}
function subnet_netmask(mask) {
return network_address(0xffffffff, mask);
}
function calcOnLoad() {
args = parseQueryString();
if (args['network'] && args['mask'] && args['division']) {
document.forms['calc'].elements['network'].value = args['network'];
document.forms['calc'].elements['netbits'].value = args['mask'];
updateNetwork();
var division = asciiToBin(args['division']);
rootSubnet = [0, 0, null];
if (division != '0') {
loadNode(rootSubnet, division);
}
recreateTables();
}
else {
updateNetwork();
}
}
function loadNode(curNode, division) {
if (division.charAt(0) == '0') {
return division.substr(1);
}
else {
curNode[2] = new Array();
curNode[2][0] = [0, 0, null];
curNode[2][1] = [0, 0, null];
division = loadNode(curNode[2][0], division.substr(1));
division = loadNode(curNode[2][1], division);
return division;
}
}
function parseQueryString(str) {
str = str ? str : location.search;
var query = str.charAt(0) == '?' ? str.substring(1) : str;
var args = new Object();
if (query) {
var fields = query.split('&');
for (var f = 0; f < fields.length; f++) {
var field = fields[f].split('=');
args[unescape(field[0].replace(/\+/g, ' '))] =
unescape(field[1].replace(/\+/g, ' '));
}
}
return args;
}
window.onload = calcOnLoad;
function toggleColumn(cb) {
var colName = 'col_' + (cb.id.substr(3));
visibleColumns[cb.id.substr(3)] = cb.checked;
recreateTables(); /* because IE draws lines all over the place with border-collapse */
}
</script>
<style type="text/css">
H1 {
font-family: Arial, Verdana, sans-serif;
font-size: 18pt;
}
BODY {
font-family: Arial, Verdana, sans-serif;
}
P {
font-family: Arial, Verdana, sans-serif;
font-size: 75%;
}
.label {
font-family: Arial, Verdana, sans-serif;
font-size: 60%;
}
.calc {
font-family: Arial, Verdana, sans-serif;
font-size: 80%;
border-collapse: collapse;
}
.calc td,
.calc th {
border: 1px solid black;
}
.calc thead {
font-weight: bold;
background-color: #eeeeee;
}
.disabledAction {
color: #dddddd;
}
.maskSpan {
background-color: #cccccc;
text-align: right;
}
.maskSpanJoinable {
background-color: #cccccc;
text-align: right;
cursor: pointer;
}
.maskSpanRotate {
filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=1);
background-color: green;
}
</style>
</head>
<body class="global-font">
<!-- Start of Navigation -->
<script>
document.addEventListener("DOMContentLoaded", function () {
el_autohide = document.querySelector('.autohide');
navbar_height = document.querySelector('.navbar').offsetHeight;
document.body.style.paddingTop = navbar_height + 'px';
if (el_autohide) {
var last_scroll_top = 0;
window.addEventListener('scroll', function () {
let scroll_top = window.scrollY;
if (scroll_top < last_scroll_top) {
el_autohide.classList.remove('scrolled-down');
el_autohide.classList.add('scrolled-up');
}
else {
el_autohide.classList.remove('scrolled-up');
el_autohide.classList.add('scrolled-down');
}
last_scroll_top = scroll_top;
});
}
});
</script>
<nav class="autohide navbar navbar-expand-lg bg-black text-white scrolled-up navbar-dark bg-dark">
<div class="container">
<div class="d-flex flex-grow-1 justify-content-start">
<a class="navbar-brand" href="https://www.prodyna.com/">
<img
src="https://uploads-ssl.webflow.com/6267a1f7a8182aa6e6312ff3/62e2654e8f998c0b17f2e2c3_prodyna%20logo.svg"
loading="lazy" alt="prodyna company logo" class="nav-logo">
</a>
</div>
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent"
aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent"></div>
</div>
</nav>
<!-- End of Navigation -->
<div class="container mt-5 mb-5 pt-4 pb-4 global-main">
<div class="row">
<div class="import-export">
<button onclick="download()">Export</button>
<button onclick="upload()">Import</button>
<input type="file" accept=".txt" onchange="handleFiles()" id="import-file" name="import-file" style="display: none;" />
<script>
function upload() {
document.getElementById("import-file").click();
}
function handleFiles() {
const [file] = document.getElementById("import-file").files;
const reader = new FileReader();
reader.addEventListener(
"load",
() => {
s = reader.result.split(';');
if (s.length === 3) {
window.open('subnets.html?network=' + s[0] + '&mask=' + s[1] + '&division=' + s[2], "_self");
} else {
alert("Wrong file!");
}
},
false,
);
if (file) {
reader.readAsText(file);
} else {
alert("Wrong file format detected in your upload process!");
}
}
function download() {
var element = document.createElement('a');
var text = inet_ntoa(curNetwork) + ';' + curMask + ';' + binToAscii(nodeToString(rootSubnet));
element.setAttribute('href', 'data:text/plain;charset=utf-8,' + encodeURIComponent(text));
element.setAttribute('download', 'network=' + inet_ntoa(curNetwork) + '&mask=' + curMask + '&division=' + binToAscii(nodeToString(rootSubnet)) + '.txt' );
element.style.display = 'none';
document.body.appendChild(element);
element.click();
document.body.removeChild(element);
}
</script>
</div>
<table width="100%" class="global-font">
<tr valign=top>
<td>
<h1>Subnet Calculator</h1>
<p>Enter the network you wish to subnet:</p>
<form name="calc" onsubmit="updateNetwork(); return false;">
<table cellspacing="0" class="global-font">
<tr>
<td class="label">Network Address</td>
<td class="label">Mask bits</td>
</tr>
<tr>
<td><input type="text" name="network" size="15" maxlength="15" value="192.168.0.0"></td>
<td>/<input type="text" name="netbits" size="2" maxlength="2" value="16"></td>
<td><input type="submit" value="Update">
<input type="button" value="Reset"
onclick="if (confirm('This will reset all subnet divisions you have made. Proceed?')) startOver();">
</td>
</tr>
</table>
<p class="global-options">Show columns:
<input type="checkbox" id="cb_subnet" checked onclick="toggleColumn(this)"><label for="cb_subnet">Subnet
address</label>
<input type="checkbox" id="cb_netmask" onclick="toggleColumn(this)"><label
for="cb_netmask">Netmask</label>
<input type="checkbox" id="cb_range" checked onclick="toggleColumn(this)"><label for="cb_range">Range of
addresses</label>
<input type="checkbox" id="cb_useable" checked onclick="toggleColumn(this)"><label
for="cb_useable">Useable
IPs</label>
<input type="checkbox" id="cb_hosts" checked onclick="toggleColumn(this)"><label
for="cb_hosts">Hosts</label>
<input type="checkbox" id="cb_divide" checked onclick="toggleColumn(this)"><label
for="cb_divide">Divide</label>
<input type="checkbox" id="cb_join" checked onclick="toggleColumn(this)"><label
for="cb_join">Join</label>
</p>
</form>
<p>Click below to split and join subnets.<br>
If you wish to save this subnetting for later, bookmark <a href="subnets.html" id="saveLink">this
hyperlink</a>.</p>
<button class="btn-copy" onclick="prepareTable('copyable')">Copy Table to Markdown</button>
<script>
function prepareTable(el){
var el = document.querySelector('#'+el);
var md = toMarkdown(el);
navigator.clipboard.writeText(md);
}
function toMarkdown(doc) {
let s = '| ';
let thead = doc.querySelector('thead');
let headcells = thead.querySelectorAll('td:not([style*="display:none"]):not([style*="display: none"]), th:not([style*="display:none"]):not([style*="display: none"]):not(.hiddenFromCopy)');
for (let i = 0; i < headcells.length; i++) {
let cell = headcells[i];
s += cell.textContent.trim() + ' | ';
}
s += '\n'
for (let i = 0; i < headcells.length; i++) {
s += '|---------'
}
s += '|\n'
let tbody = doc.querySelector('tbody');
let trs = tbody.querySelectorAll('tr');
for (let i = 0; i < trs.length; i++) {
s += '| '
let tr = trs.item(i);
let tds = tr.querySelectorAll('td:not([style*="display:none"]):not([style*="display: none"]):not(.hiddenFromCopy)');
for (let j = 0; j < tds.length; j++) {
let td = tds.item(j);
s += td.textContent.trim() + ' | ';
}
s += '\n';
}
return s;
}
</script>
</td>
</tr>
</table>
<br>
<hr noshade color="black" size="1">
<br>
<table id="copyable" class="calc global-font" cellspacing="0" cellpadding="2">
<thead class="text-black">
<tr>
<th id="subnetHeader">Subnet address</th>
<th id="netmaskHeader">Netmask</th>
<th id="rangeHeader">Range of addresses</th>
<th id="useableHeader">Useable IPs</th>
<th id="hostsHeader">Hosts</th>
<th id="divideHeader" class="hiddenFromCopy">Divide</th>
<th id="joinHeader" class="hiddenFromCopy">Join</th>
</tr>
</thead>
<tbody id="calcbody"></tbody>
</table>
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