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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Prefix Validator</title>
<style>
body {
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
background-color: #18191a;
color: #e4e6eb;
display: flex;
justify-content: center;
align-items: flex-start;
min-height: 100vh;
margin: 0;
padding: 2rem;
}
.container {
background-color: #242526;
padding: 2rem;
border-radius: 8px;
box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
width: 100%;
max-width: 600px;
text-align: center;
}
h1 {
margin-top: 0;
color: #e4e6eb;
}
.input-group {
margin-bottom: 1rem;
text-align: left;
}
.input-group label {
display: block;
margin-bottom: 0.5rem;
font-weight: 500;
}
input[type="text"] {
width: 100%;
padding: 0.75rem;
border: 1px solid #404040;
border-radius: 6px;
font-size: 1rem;
box-sizing: border-box;
background-color: #3a3b3c;
color: #e4e6eb;
}
button {
width: 100%;
padding: 0.75rem;
border: none;
border-radius: 6px;
background-color: #1877f2;
color: #fff;
font-size: 1.1rem;
font-weight: bold;
cursor: pointer;
transition: background-color 0.2s;
}
button:hover {
background-color: #166fe5;
}
.home-button {
position: absolute;
top: 1rem;
left: 1rem;
padding: 0.5rem 1rem;
background-color: #3a3b3c;
color: #e4e6eb;
text-decoration: none;
border-radius: 6px;
font-size: 0.9rem;
font-weight: 500;
border: 1px solid #404040;
transition: background-color 0.2s;
}
.home-button:hover {
background-color: #4e4f50;
text-decoration: none;
}
#results {
margin-top: 1.5rem;
padding: 1rem;
background-color: #3a3b3c;
border: 1px solid #404040;
border-radius: 6px;
text-align: left;
min-height: 50px;
}
.results-section {
margin-bottom: 1rem;
padding-bottom: 1rem;
border-bottom: 1px solid #404040;
}
.results-section:last-child {
margin-bottom: 0;
padding-bottom: 0;
border-bottom: none;
}
.results-section h4 {
margin-top: 0;
margin-bottom: 0.5rem;
color: #e4e6eb;
}
.ip-list {
list-style-type: none;
padding-left: 0;
margin: 0;
font-family: "Courier New", Courier, monospace;
}
.status {
font-weight: bold;
padding: 0.5rem;
border-radius: 4px;
text-align: center;
}
.status-valid {
background-color: #2e4a2f;
color: #6aba6e;
}
.status-invalid {
background-color: #5a2a2a;
color: #ff8a80;
}
</style>
</head>
<body>
<a href="index.html" class="home-button">← Home</a>
<div class="container">
<h1>Prefix Validator IPv4</h1>
<div class="input-group">
<label for="prefix">IP Prefix</label>
<input type="text" id="prefix" placeholder="e.g., 10.0.4.0/31">
</div>
<div class="input-group">
<label for="subnet">Containing Subnet</label>
<input type="text" id="subnet" placeholder="e.g., 10.0.0.0/8 or 29">
</div>
<button id="checkButton">Check Prefix</button>
<div id="results"></div>
</div>
<script>
document.addEventListener('DOMContentLoaded', () => {
const prefixInput = document.getElementById('prefix');
const subnetInput = document.getElementById('subnet');
const checkButton = document.getElementById('checkButton');
const resultsDiv = document.getElementById('results');
// --- Helper Functions ---
const ipToInt = (ip) => {
if (typeof ip !== 'string' || !ip.match(/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/)) return NaN;
return ip.split('.').reduce((int, octet) => (int << 8) + parseInt(octet, 10), 0) >>> 0;
};
const intToIp = (int) => {
if (typeof int !== 'number' || int < 0 || int > 0xFFFFFFFF) return '';
return `${(int >>> 24)}.${(int >> 16) & 0xFF}.${(int >> 8) & 0xFF}.${int & 0xFF}`;
};
// --- Reserved IP Ranges Logic ---
const testIsReservedIp = (ip) => {
const ip_int = ipToInt(ip);
const private_ranges = [{ net: "10.0.0.0", cidr: 8 }, { net: "172.16.0.0", cidr: 12 }, { net: "192.168.0.0", cidr: 16 }];
const reserved_ranges = [
{ net: "0.0.0.0", cidr: 8 }, { net: "100.64.0.0", cidr: 10 }, { net: "127.0.0.0", cidr: 8 }, { net: "169.254.0.0", cidr: 16 },
{ net: "192.0.0.0", cidr: 24 }, { net: "192.0.2.0", cidr: 24 }, { net: "192.88.99.0", cidr: 24 }, { net: "198.18.0.0", cidr: 15 },
{ net: "198.51.100.0", cidr: 24 }, { net: "203.0.113.0", cidr: 24 }, { net: "224.0.0.0", cidr: 4 }, { net: "240.0.0.0", cidr: 4 },
{ net: "255.255.255.255", cidr: 32 }];
const checkRanges = (ranges) => {
for (const range of ranges) {
const net_ip_int = ipToInt(range.net);
const mask = (0xFFFFFFFF << (32 - range.cidr)) >>> 0;
const net_start = net_ip_int & mask;
const net_end = net_start + Math.pow(2, (32 - range.cidr)) - 1;
if (ip_int >= net_start && ip_int <= net_end) return true;
}
return false;
};
if (checkRanges(private_ranges)) return "PRIVATE";
if (checkRanges(reserved_ranges)) return "RESERVED";
return "PUBLIC";
};
// --- Main Check Logic ---
checkButton.addEventListener('click', () => {
resultsDiv.innerHTML = ''; // Clear previous results
const input_prefix = prefixInput.value.trim();
const containing_subnet_arg = subnetInput.value.trim();
// --- Input Validation ---
if (!input_prefix || !containing_subnet_arg) {
resultsDiv.innerHTML = '<p class="status status-invalid">Error: Both input fields are required.</p>';
return;
}
const prefix_parts = input_prefix.split('/');
if (prefix_parts.length !== 2) {
resultsDiv.innerHTML = '<p class="status status-invalid">Error: Invalid IP/PREFIX format.</p>';
return;
}
const input_ip = prefix_parts[0];
const input_cidr = parseInt(prefix_parts[1], 10);
const input_ip_int = ipToInt(input_ip);
if (isNaN(input_ip_int)) {
resultsDiv.innerHTML = '<p class="status status-invalid">Error: Invalid IP address format.</p>';
return;
}
if (isNaN(input_cidr) || input_cidr < 0 || input_cidr > 32) {
resultsDiv.innerHTML = '<p class="status status-invalid">Error: Invalid input CIDR prefix size.</p>';
return;
}
let containing_cidr = 0;
let containing_net_ip = "";
if (containing_subnet_arg.includes('/')) {
const subnet_parts = containing_subnet_arg.split('/');
containing_net_ip = subnet_parts[0];
containing_cidr = parseInt(subnet_parts[1], 10);
} else {
containing_cidr = parseInt(containing_subnet_arg, 10);
}
if (isNaN(containing_cidr) || containing_cidr < 0 || containing_cidr > 32) {
resultsDiv.innerHTML = '<p class="status status-invalid">Error: Invalid containing CIDR prefix size.</p>';
return;
}
if (input_cidr < containing_cidr) {
resultsDiv.innerHTML = '<p class="status status-invalid">Error: Input prefix cannot be larger than the containing subnet.</p>';
return;
}
// --- Main Processing ---
const prefix_type = testIsReservedIp(input_ip);
if (prefix_type === "RESERVED") {
resultsDiv.innerHTML = `<p class="status status-invalid">Result: Prefix ${input_prefix} is INVALID because it belongs to a reserved unroutable namespace.</p>`;
return;
}
const containing_mask = (0xFFFFFFFF << (32 - containing_cidr)) >>> 0;
let containing_net_int = 0;
if (containing_net_ip) {
containing_net_int = ipToInt(containing_net_ip);
if ((containing_net_int & containing_mask) !== containing_net_int) {
const correct_net_ip = intToIp(containing_net_int & containing_mask);
resultsDiv.innerHTML = `<p class="status status-invalid">Error: The provided containing subnet '${containing_subnet_arg}' is not a valid network address. For a /${containing_cidr} prefix, the network address should be ${correct_net_ip}.</p>`;
return;
}
if ((input_ip_int & containing_mask) !== containing_net_int) {
resultsDiv.innerHTML = `<p class="status status-invalid">Error: The input IP '${input_ip}' does not belong to the specified containing subnet '${containing_subnet_arg}'.</p>`;
return;
}
} else {
containing_net_int = input_ip_int & containing_mask;
containing_net_ip = intToIp(containing_net_int);
}
let outputHTML = '';
outputHTML += `<div class="results-section"><h4>Input Details</h4><p><strong>Input Prefix:</strong> ${input_prefix}<br><strong>Containing Subnet:</strong> ${containing_net_ip}/${containing_cidr}</p></div>`;
const reserved_ips = [];
reserved_ips.push(intToIp(containing_net_int + 0));
reserved_ips.push(intToIp(containing_net_int + 1));
reserved_ips.push(intToIp(containing_net_int + 2));
reserved_ips.push(intToIp(containing_net_int + 3));
const broadcast_offset = Math.pow(2, 32 - containing_cidr) - 1;
const broadcast_int = containing_net_int + broadcast_offset;
reserved_ips.push(intToIp(broadcast_int));
outputHTML += `<div class="results-section"><h4>Reserved IPs in /${containing_cidr} Block</h4><ul class="ip-list"><li>${reserved_ips.join('</li><li>')}</li></ul></div>`;
const mask_input = (0xFFFFFFFF << (32 - input_cidr)) >>> 0;
const net_input_int = input_ip_int & mask_input;
const bcast_input_int = net_input_int + Math.pow(2, 32 - input_cidr) - 1;
let scanned_ips_html = '';
let is_invalid = false;
let final_result_html = '';
for (let i = net_input_int; i <= bcast_input_int; i++) {
const current_ip = intToIp(i);
scanned_ips_html += `<li>${current_ip}</li>`;
if (reserved_ips.includes(current_ip)) {
final_result_html = `<p class="status status-invalid">Result: Prefix ${input_prefix} is a ${prefix_type} prefix and is INVALID because it contains reserved IP ${current_ip}.</p>`;
is_invalid = true;
break;
}
}
outputHTML += `<div class="results-section"><h4>Scanned IP Range</h4><ul class="ip-list">${scanned_ips_html}</ul></div>`;
if (!is_invalid) {
final_result_html = `<p class="status status-valid">Result: Prefix ${input_prefix} is a ${prefix_type} prefix and is VALID for assignment.</p>`;
}
outputHTML += `<div class="results-section"><h4>Final Result</h4>${final_result_html}</div>`;
resultsDiv.innerHTML = outputHTML;
});
});
</script>
</body>
</html>