{"id":8804,"date":"2026-08-05T13:59:19","date_gmt":"2026-08-05T11:59:19","guid":{"rendered":"https:\/\/www.lukaswojcik.com\/blog\/?page_id=8804"},"modified":"2026-08-05T14:00:46","modified_gmt":"2026-08-05T12:00:46","slug":"unifi-iot-vlan-subnet-cidr-calculator","status":"publish","type":"page","link":"https:\/\/www.lukaswojcik.com\/blog\/en\/toolbox\/unifi-iot-vlan-subnet-cidr-calculator\/","title":{"rendered":"UniFi \/ IoT VLAN Subnet &#038; CIDR Calculator"},"content":{"rendered":"<div class=\"gtm-analyser-container\" style=\"background: var(--bg-panel, #1e1e24); padding: 25px; border-radius: 8px; border: 1px solid var(--border, #2a2a35);\">\n<p style=\"color: var(--text-secondary); margin-bottom: 20px;\">\n        Calculate IP ranges, broadcast addresses, and segmented static\/DHCP device blocks for home network isolation.\n    <\/p>\n<div style=\"display: flex; gap: 10px; align-items: flex-end; flex-wrap: wrap; margin-bottom: 20px;\">\n<div style=\"flex: 1; min-width: 260px;\">\n            <label style=\"color: var(--text-secondary); display: block; font-size: 0.85rem; margin-bottom: 5px;\">VLAN CIDR Block:<\/label><br \/>\n            <input type=\"text\" id=\"cidr-input\" value=\"192.168.50.0\/24\" class=\"form-control\" style=\"width: 100%; padding: 12px; background: var(--bg-body); border: 1px solid var(--border); color: var(--text-primary); border-radius: 6px; font-family: monospace;\">\n        <\/div>\n<p>        <button id=\"calc-cidr-btn\" class=\"button\" style=\"background: var(--accent); color: #0b1114; border: none; padding: 12px 24px; border-radius: 6px; font-weight: 700; cursor: pointer;\">Calculate Subnet<\/button>\n    <\/div>\n<div id=\"cidr-results\"><\/div>\n<\/div>\n<p><script>\ndocument.getElementById(\"calc-cidr-btn\").addEventListener(\"click\", () => {\n    const input = document.getElementById(\"cidr-input\").value.trim();\n    const parts = input.split(\"\/\");\n    const results = document.getElementById(\"cidr-results\");<\/p>\n<p>    if (parts.length !== 2 || isNaN(parts[1]) || parts[1] < 16 || parts[1] > 30) {\n        results.innerHTML = \"<\/p>\n<p style='color:#ff6b6b;'>Please enter a valid IPv4 CIDR block between \/16 and \/30 (e.g., 192.168.50.0\/24).<\/p>\n<p>\";\n        return;\n    }<\/p>\n<p>    const ip = parts[0].split(\".\").map(Number);\n    const maskBits = parseInt(parts[1], 10);\n    const hostBits = 32 - maskBits;\n    const totalHosts = Math.pow(2, hostBits);\n    const usableHosts = totalHosts - 2;<\/p>\n<p>    const ipNum = ip[0] * 16777216 + ip[1] * 65536 + ip[2] * 256 + ip[3];\n    const netNum = Math.floor(ipNum \/ totalHosts) * totalHosts;\n    const broadNum = netNum + totalHosts - 1;<\/p>\n<p>    const numToIp = (num) => {\n        const o1 = Math.floor(num \/ 16777216) % 256;\n        const o2 = Math.floor(num \/ 65536) % 256;\n        const o3 = Math.floor(num \/ 256) % 256;\n        const o4 = num % 256;\n        return [o1, o2, o3, o4].join(\".\");\n    };<\/p>\n<p>    const netIp = numToIp(netNum);\n    const broadIp = numToIp(broadNum);\n    const firstIp = numToIp(netNum + 1);\n    const secondIp = numToIp(netNum + 2);\n    const staticStart = numToIp(netNum + 10);\n    const staticEnd = numToIp(netNum + 50);\n    const dhcpStart = numToIp(netNum + 100);\n    const dhcpEnd = numToIp(broadNum - 5);<\/p>\n<p>    results.innerHTML = [\n        \"<\/p>\n<div style='display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; margin-bottom: 20px;'>\",\n        \"    <\/p>\n<div style='background: var(--bg-body); padding: 15px; border-radius: 6px; border: 1px solid var(--border);'>\",\n        \"        <span style='color: var(--text-secondary); font-size: 0.85rem; display: block;'>Network Address<\/span>\",\n        \"        <strong style='color: var(--accent); font-size: 1.1rem; font-family: monospace;'>\" + netIp + \"<\/strong>\",\n        \"    <\/div>\n<p>\",\n        \"    <\/p>\n<div style='background: var(--bg-body); padding: 15px; border-radius: 6px; border: 1px solid var(--border);'>\",\n        \"        <span style='color: var(--text-secondary); font-size: 0.85rem; display: block;'>Broadcast Address<\/span>\",\n        \"        <strong style='color: var(--accent); font-size: 1.1rem; font-family: monospace;'>\" + broadIp + \"<\/strong>\",\n        \"    <\/div>\n<p>\",\n        \"    <\/p>\n<div style='background: var(--bg-body); padding: 15px; border-radius: 6px; border: 1px solid var(--border);'>\",\n        \"        <span style='color: var(--text-secondary); font-size: 0.85rem; display: block;'>Usable Host Range<\/span>\",\n        \"        <strong style='color: #51cf66; font-size: 1rem; font-family: monospace;'>\" + firstIp + \" - \" + numToIp(broadNum - 1) + \"<\/strong>\",\n        \"    <\/div>\n<p>\",\n        \"    <\/p>\n<div style='background: var(--bg-body); padding: 15px; border-radius: 6px; border: 1px solid var(--border);'>\",\n        \"        <span style='color: var(--text-secondary); font-size: 0.85rem; display: block;'>Total Usable Hosts<\/span>\",\n        \"        <strong style='color: var(--text-primary); font-size: 1.1rem;'>\" + usableHosts + \"<\/strong>\",\n        \"    <\/div>\n<p>\",\n        \"<\/p><\/div>\n<p>\",\n        \"<\/p>\n<h4 style='color: var(--accent); margin-bottom: 10px;'>UniFi Network Segmentation Blueprint<\/h4>\n<p>\",\n        \"<\/p>\n<table style='width: 100%; border-collapse: collapse; background: var(--bg-body); border-radius: 6px; overflow: hidden;'>\",\n        \"    <\/p>\n<tr style='border-bottom: 1px solid var(--border);'>\n<td style='padding: 10px; color: var(--text-secondary);'>UniFi Security Gateway \/ Router<\/td>\n<td style='padding: 10px; color: #51cf66; font-family: monospace;'>\" + firstIp + \"<\/td>\n<\/tr>\n<p>\",\n        \"    <\/p>\n<tr style='border-bottom: 1px solid var(--border);'>\n<td style='padding: 10px; color: var(--text-secondary);'>Managed Aggregation Switch<\/td>\n<td style='padding: 10px; color: #51cf66; font-family: monospace;'>\" + secondIp + \"<\/td>\n<\/tr>\n<p>\",\n        \"    <\/p>\n<tr style='border-bottom: 1px solid var(--border);'>\n<td style='padding: 10px; color: var(--text-secondary);'>Recommended Static IPs (Servers\/NVR)<\/td>\n<td style='padding: 10px; color: var(--accent); font-family: monospace;'>\" + staticStart + \" - \" + staticEnd + \"<\/td>\n<\/tr>\n<p>\",\n        \"    <\/p>\n<tr>\n<td style='padding: 10px; color: var(--text-secondary);'>IoT DHCP Pool (Cameras\/Sensors)<\/td>\n<td style='padding: 10px; color: var(--text-primary); font-family: monospace;'>\" + dhcpStart + \" - \" + dhcpEnd + \"<\/td>\n<\/tr>\n<p>\",\n        \"<\/table>\n<p>\"\n    ].join(\"\");\n});\ndocument.getElementById(\"calc-cidr-btn\").click();\n<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Calculate usable IP host ranges, broadcast addresses, and VLAN segmentation layouts for home networking.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":38,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"template-tool-base.php","meta":{"footnotes":""},"class_list":["post-8804","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>UniFi \/ IoT VLAN Subnet &amp; CIDR Calculator - Lukas Wojcik - Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.lukaswojcik.com\/blog\/en\/toolbox\/unifi-iot-vlan-subnet-cidr-calculator\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"UniFi \/ IoT VLAN Subnet &amp; 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