{"id":5939,"date":"2022-07-15T13:09:27","date_gmt":"2022-07-15T13:09:27","guid":{"rendered":"https:\/\/www.practicallynetworked.com\/?p=5939"},"modified":"2022-07-15T14:24:34","modified_gmt":"2022-07-15T14:24:34","slug":"subnet-calculator","status":"publish","type":"post","link":"https:\/\/www.practicallynetworked.com\/subnet-calculator\/","title":{"rendered":"Subnet Calculator"},"content":{"rendered":"\n<p>This calculator returns a variety of information regarding Internet Protocol version 4 (IPv4) subnets including possible network addresses, usable host ranges, subnet mask, and IP class, among others.<\/p>\n\n\n\n<style>\n\n\n.container1 {\n\tborder: 3px solid #f1f1f1;\n\tmargin: 1em 10em 1em 10em;\n\tpadding: 1em;\n}\n\n.container1 label {\n\tfont-weight: bold;\n}\n\n.container1 input[type=text] {\n\twidth: 100%;\n\tpadding: 10px 15px;\n\tmargin: 8px 0;\n\tdisplay: inline-block;\n\tborder: 1px solid #C0C0C0;\n\tbox-sizing: border-box;\n}\n\n.container1 input[readonly] {\n\tbackground-color: #F0F0F0;\n\toutline: none;\n}\n\n.container1 button {\n\tbackground-color: #04AA6D;\n\tcolor: white;\n\tpadding: 10px 15px;\n\tmargin: 8px 0;\n\tborder: none;\n\tcursor: pointer;\n\twidth: 100%;\n}\n\n.container1 button:hover {\n\topacity: 0.8;\n}\n\n\n\n<\/style>\n<h2>IP Calculator<\/h2>\n\n\t<div class=\"container1\">\n\t\t<label>IP<\/label>\n\t\t<input type=\"text\" id=\"text_in_ip\" placeholder=\"192.168.1.1\" value=\"192.168.1.1\">\n\n\t\t<label>Netmask<\/label>\n\t\t<input type=\"text\" id=\"text_in_netmask\" placeholder=\"255.255.255.0 or \/24\" value=\"\/24\">\n\n\t\t<button onclick=\"buttonCalculate();\">Calculate<\/button>\n\t<\/div>\n  \n\t<div class=\"container1\">\n\t\t<label>Number of Networks<\/label>\n\t\t<input type=\"text\" id=\"text_out_numNetworks\" value=\"\" readonly=\"\">\n\n\t\t<label>Number of hosts<\/label>\n\t\t<input type=\"text\" id=\"text_out_numHosts\" value=\"\" readonly=\"\">\n\t\t\n\t\t<label>Masks<\/label>\n\t\t<input type=\"text\" id=\"text_out_netmask\" value=\"\" readonly=\"\">\n\n\t\t<label>CIDR<\/label>\n\t\t<input type=\"text\" id=\"text_out_cidr\" value=\"\" readonly=\"\">\n\t\t\n\t\t<label>IP<\/label>\n\t\t<input type=\"text\" id=\"text_out_ipNetwork\" value=\"\" readonly=\"\">\n\t\t\n\t\t<label>Broadcast<\/label>\n\t\t<input type=\"text\" id=\"text_out_ipBroadcast\" value=\"\" readonly=\"\">\n\t\t\n\t\t<label>Range<\/label>\n\t\t<input type=\"text\" id=\"text_out_iprange\" value=\"\" readonly=\"\">\n\t<\/div>\n\n\n\n<p>\n<script type=\"text\/javascript\">\r\n\t\r\n\tfunction int2ip(ipInt) {\r\n\t\treturn ( (ipInt>>>24) + '.' + (ipInt>>16 & 255) + '.' + (ipInt>>8 & 255) + '.' + (ipInt & 255) );\r\n\t}\r\n\t\r\n\tfunction ip2int(ipStr) {\r\n\t\treturn ipStr.split('.').reduce(function(ipInt, octet) { return (ipInt<<8) + parseInt(octet, 10)}, 0) >>> 0;\r\n\t}\r\n\t\r\n\tfunction netmask2cidr(ipNetmask) {\r\n\t\tvar maskNodes = ipNetmask.match(\/(\\d+)\/g);\r\n\t\tvar cidr = 0;\r\n\t\t\r\n\t\tfor(var i in maskNodes) {\r\n\t\t  cidr += (((maskNodes[i] >>> 0).toString(2)).match(\/1\/g) || []).length;\r\n\t\t}\r\n\t\t\r\n\t\treturn cidr;\r\n\t}\r\n\t\r\n\tfunction cidr2netmask(cidr) {\r\n\t\tvar netmask = [], i, n;\r\n\t\t\r\n\t\tfor(i=0; i<4; i++) {\r\n\t\t\tn = Math.min(cidr, 8);\r\n\t\t\tnetmask.push(256 - Math.pow(2, 8-n));\r\n\t\t\tcidr -= n;\r\n\t\t}\r\n\t\t\r\n\t\treturn netmask.join('.');\r\n\t}\r\n\t\r\n\tfunction ipAddressCheck(ipAddr) {\r\n\t\tvar strOctets = ipAddr.split(\".\");\r\n\t\t\r\n\t\tif(strOctets.length !== 4) {\r\n\t\t\treturn false;\r\n\t\t}\r\n\t\t\r\n\t\tfor(var strOctet of strOctets) {\r\n\t\t\tvar intOctet = parseInt(strOctet);\r\n\t\t\tif(intOctet != intOctet) {\r\n\t\t\t\treturn false;\r\n\t\t\t}\r\n\t\t\tif(intOctet < 0 || 255 < intOctet) {\r\n\t\t\t\treturn false;\r\n\t\t\t}\r\n\t\t}\r\n\t\t\r\n\t\treturn true;\r\n\t}\r\n\t\r\n\tfunction cidrCheck(cidr) {\r\n\t\tif(! cidr.startsWith('\/')) {\r\n\t\t\treturn false;\r\n\t\t}\r\n\r\n\t\tcidr = parseInt(cidr.substr(1));\r\n\t\tif(cidr != cidr) {\r\n\t\t\treturn false;\r\n\t\t}\r\n\t\t\r\n\t\tif(cidr < 0 || 32 < cidr) {\r\n\t\t\treturn false;\r\n\t\t}\r\n\t\t\r\n\t\treturn true;\r\n\t}\r\n\t\r\n\tfunction clearOutputs() {\r\n\t\tdocument.getElementById(\"text_out_numNetworks\").value = \"\";\r\n\t\tdocument.getElementById(\"text_out_numHosts\").value = \"\";\r\n\t\tdocument.getElementById(\"text_out_netmask\").value = \"\";\r\n\t\tdocument.getElementById(\"text_out_ipNetwork\").value = \"\";\r\n\t\tdocument.getElementById(\"text_out_ipBroadcast\").value = \"\";\r\n\t\tdocument.getElementById(\"text_out_iprange\").value = \"\";\r\n\t}\r\n\t\r\n\tfunction buttonCalculate() {\t\t\r\n\t\tvar ipAddr = document.getElementById(\"text_in_ip\").value;\r\n\t\tvar netmask = document.getElementById(\"text_in_netmask\").value;\r\n\t\t\r\n\t\tif(! ipAddressCheck(ipAddr)) {\r\n\t\t\talert(\"Invalid \" + ipAddr + \" address.\");\r\n\t\t\tclearOutputs();\r\n\t\t\treturn false;\r\n\t\t}\r\n\t\t\r\n\t\tif(netmask.startsWith('\/')) {\r\n\t\t\t\r\n\t\t\tif(! cidrCheck(netmask)) {\r\n\t\t\t\talert(\"Invalid CIDR \" + netmask + \".\");\r\n\t\t\t\tclearOutputs();\r\n\t\t\t\treturn false;\r\n\t\t\t}\r\n\t\t\t\r\n\t\t\tcidrNetmask = parseInt(netmask.substr(1));\r\n\t\t\tipNetmask = cidr2netmask(cidrNetmask);\r\n\t\t\t\r\n\t\t} else {\r\n\t\t\t\r\n\t\t\tif(! ipAddressCheck(netmask)) {\r\n\t\t\t\talert(\"Invalid \" + netmask + \" netmask.\");\r\n\t\t\t\tclearOutputs();\r\n\t\t\t\treturn false;\r\n\t\t\t}\r\n\t\t\t\r\n\t\t\tcidrNetmask = netmask2cidr(netmask);\r\n\t\t\tipNetmask = cidr2netmask(cidrNetmask);\r\n\t\t\t\r\n\t\t\tif(netmask !== ipNetmask) {\r\n\t\t\t\talert(\"Invalid netmask \" + netmask + \".\");\r\n\t\t\t\tclearOutputs();\r\n\t\t\t\treturn false;\r\n\t\t\t}\r\n\t\t}\r\n\t\t\r\n\t\tif(cidrNetmask < 32) {\r\n\t\t\tnumNetworks = 2 ** cidrNetmask;\r\n\t\t} else {\r\n\t\t\tnumNetworks = 0;\r\n\t\t}\r\n\t\t\r\n\t\tif(cidrNetmask < 32) {\r\n\t\t\tnumHosts = 2 ** (32 - cidrNetmask) - 2;\r\n\t\t} else {\r\n\t\t\tnumHosts = 1;\r\n\t\t}\r\n\t\t\r\n\t\tif(cidrNetmask < 32) {\r\n\t\t\tintIpAddr = ip2int(ipAddr);\r\n\t\t\tintNetmask = ip2int(ipNetmask);\r\n\t\t\t\t\t\t\t\r\n\t\t\tintipNetwork = intIpAddr & intNetmask;\r\n\t\t\tintBroadcast = intIpAddr | ~intNetmask;\r\n\t\t\t\r\n\t\t\tipNetwork = int2ip(intipNetwork);\r\n\t\t\tipBroadcast = int2ip(intBroadcast);\r\n\t\t} else {\r\n\t\t\tipNetwork = \"\";\r\n\t\t\tipBroadcast = \"\";\r\n\t\t}\r\n\t\t\r\n\t\tif(cidrNetmask < 31) {\r\n\t\t\tipAddrMin = int2ip(intipNetwork + 1);\r\n\t\t\tipAddrMax = int2ip(intBroadcast - 1);\r\n\t\t} else {\r\n\t\t\tipAddrMin = \"\";\r\n\t\t\tipAddrMax = \"\";\r\n\t\t}\r\n\t\t\r\n\t\tdocument.getElementById(\"text_out_numNetworks\").value = numNetworks;\r\n\t\tdocument.getElementById(\"text_out_numHosts\").value = numHosts;\r\n\t\t\r\n\t\tdocument.getElementById(\"text_out_netmask\").value = ipNetmask;\r\n\t\tdocument.getElementById(\"text_out_cidr\").value = \"\/\" + cidrNetmask;\r\n\t\t\r\n\t\tdocument.getElementById(\"text_out_ipNetwork\").value = ipNetwork;\r\n\t\tdocument.getElementById(\"text_out_ipBroadcast\").value = ipBroadcast;\r\n\t\t\r\n\t\tdocument.getElementById(\"text_out_iprange\").value = ipAddrMin + \"-\" + ipAddrMax;\r\n\t\t\r\n\t\treturn true;\r\n\t}\r\n\t\r\n<\/script>\n<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This calculator returns a variety of information regarding Internet Protocol version 4 (IPv4) subnets including possible network addresses, usable host ranges, subnet mask, and IP class, among others. IP Calculator IP Netmask Calculate Number of Networks Number of hosts Masks CIDR IP Broadcast Range<\/p>\n","protected":false},"author":1,"featured_media":5594,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"_links":{"self":[{"href":"https:\/\/www.practicallynetworked.com\/wp-json\/wp\/v2\/posts\/5939"}],"collection":[{"href":"https:\/\/www.practicallynetworked.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.practicallynetworked.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.practicallynetworked.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.practicallynetworked.com\/wp-json\/wp\/v2\/comments?post=5939"}],"version-history":[{"count":16,"href":"https:\/\/www.practicallynetworked.com\/wp-json\/wp\/v2\/posts\/5939\/revisions"}],"predecessor-version":[{"id":5961,"href":"https:\/\/www.practicallynetworked.com\/wp-json\/wp\/v2\/posts\/5939\/revisions\/5961"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.practicallynetworked.com\/wp-json\/wp\/v2\/media\/5594"}],"wp:attachment":[{"href":"https:\/\/www.practicallynetworked.com\/wp-json\/wp\/v2\/media?parent=5939"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.practicallynetworked.com\/wp-json\/wp\/v2\/categories?post=5939"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.practicallynetworked.com\/wp-json\/wp\/v2\/tags?post=5939"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}