{"id":18371,"date":"2026-10-01T08:32:55","date_gmt":"2026-10-01T11:32:55","guid":{"rendered":"https:\/\/www.homehost.com.br\/blog\/?p=18371"},"modified":"2026-10-01T08:33:03","modified_gmt":"2026-10-01T11:33:03","slug":"mascara-de-sub-rede","status":"publish","type":"post","link":"https:\/\/www.homehost.com.br\/blog\/internet\/mascara-de-sub-rede\/","title":{"rendered":"M\u00e1scara de sub-rede e CIDR: tabela completa e calculadora de IP"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Todo endere\u00e7o IP vem acompanhado de uma m\u00e1scara \u2014 o <code>255.255.255.0<\/code> que aparece na configura\u00e7\u00e3o de rede, ou o <code>\/24<\/code> que o comando <code>ip addr<\/code> mostra no Linux. <strong>\u00c9 ela que diz quais endere\u00e7os fazem parte da mesma rede<\/strong>, quantos dispositivos cabem nela e onde a rede come\u00e7a e termina.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Este guia traz uma <strong>calculadora<\/strong> que faz todas essas contas para qualquer endere\u00e7o, a <strong>tabela completa de m\u00e1scaras<\/strong>, de <code>\/8<\/code> a <code>\/32<\/code>, e a explica\u00e7\u00e3o de como o c\u00e1lculo funciona \u2014 incluindo como dividir uma rede em sub-redes menores.<\/p>\n\n\n\n<div style=\"border:1px solid #9db4d6; border-left:4px solid #0b3d91; background:#eef3fa; border-radius:8px; padding:18px 22px; margin:24px 0; font-family:Arial, Helvetica, sans-serif;\">\n<div style=\"font-weight:700; color:#0b3d91; margin-bottom:10px; text-transform:uppercase; letter-spacing:.05em; font-size:14px;\">Resposta r\u00e1pida<\/div>\n<p style=\"margin:0; line-height:1.65; color:#16243d;\">A <strong>m\u00e1scara de sub-rede<\/strong> separa o endere\u00e7o IP em duas partes: a <strong>rede<\/strong> e o <strong>dispositivo<\/strong>. O <strong>\/24<\/strong> \u2014 ou <strong>255.255.255.0<\/strong> \u2014 significa que os primeiros 24 bits identificam a rede, sobrando <strong>256 endere\u00e7os<\/strong>, dos quais <strong>254 podem ser usados<\/strong> por dispositivos: o primeiro \u00e9 o endere\u00e7o da rede e o \u00faltimo, o de broadcast.<\/p>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Calculadora de IP e sub-rede<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Digite um endere\u00e7o com o prefixo \u2014 como 192.168.1.10\/24 \u2014 ou escolha a m\u00e1scara na lista. A calculadora mostra o endere\u00e7o de rede, o broadcast, a faixa de IPs utiliz\u00e1veis, o n\u00famero de hosts, a m\u00e1scara em bin\u00e1rio e o tipo de endere\u00e7o \u2014 e divide a rede em sub-redes menores.<\/p>\n\n\n\n<div class=\"hh-subnet\" style=\"max-width:780px;margin:28px auto;border:1px solid #c9d6ea;border-radius:14px;padding:22px 24px;background:#f7faff;font-family:Arial,Helvetica,sans-serif;color:#16243d;font-size:15px;\">\n<div style=\"font-weight:800;font-size:19px;color:#0b3d91;margin-bottom:4px;\">Calculadora de IP e sub-rede<\/div>\n<p style=\"margin:0 0 12px;line-height:1.5;font-size:14.5px;\">Digite um endere\u00e7o IPv4 \u2014 com o prefixo, como 192.168.1.10\/24, ou escolha a m\u00e1scara na lista.<\/p>\n<div style=\"display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:10px 22px;\">\n<div><label for=\"hh-sn-ip\" style=\"display:block;font-weight:700;margin-bottom:4px;\">Endere\u00e7o IP<\/label>\n<input type=\"text\" id=\"hh-sn-ip\" value=\"192.168.1.10\/24\" style=\"width:100%;box-sizing:border-box;padding:9px 11px;border:1px solid #9db4d6;border-radius:8px;font-family:Consolas,Menlo,monospace;font-size:16px;\"><\/div>\n<div><label for=\"hh-sn-mask\" style=\"display:block;font-weight:700;margin-bottom:4px;\">M\u00e1scara de sub-rede<\/label>\n<select id=\"hh-sn-mask\" style=\"width:100%;padding:9px 10px;border:1px solid #9db4d6;border-radius:8px;font-family:Consolas,Menlo,monospace;font-size:14.5px;\"><\/select><\/div>\n<\/div>\n<div id=\"hh-sn-out\" aria-live=\"polite\" style=\"margin-top:14px;\"><\/div>\n<div style=\"margin-top:14px;\">\n<label for=\"hh-sn-div\" style=\"display:block;font-weight:700;margin-bottom:4px;\">Dividir esta rede<\/label>\n<select id=\"hh-sn-div\" style=\"width:100%;max-width:360px;padding:8px 10px;border:1px solid #9db4d6;border-radius:8px;\"><\/select>\n<div id=\"hh-sn-subs\" style=\"margin-top:10px;\"><\/div>\n<\/div>\n<p style=\"margin:12px 0 0;font-size:12.5px;color:#3a4a63;line-height:1.5;\">C\u00e1lculos para IPv4. Nas redes \/31 (liga\u00e7\u00f5es ponto a ponto) os dois endere\u00e7os s\u00e3o utiliz\u00e1veis, e uma \/32 representa um \u00fanico endere\u00e7o. Fonte: homehost.com.br<\/p>\n<\/div>\n<script>(function () { var TWO32=4294967296; function inR(v,a,b){return Math.max(a,Math.min(b,v))===v;} function pow2(k){return Math.pow(2,k);} function digitsOnly(s){if(s===\"\"){return false;}for(var i=0;i!==s.length;i++){if(\"0123456789\".indexOf(s.charAt(i))===-1){return false;}}return true;} function parseIP(s){s=String(s||\"\").split(\" \").join(\"\");var p=s.split(\".\");if(p.length!==4){return null;}var n=0;for(var i=0;i!==4;i++){if(!digitsOnly(p[i])){return null;}if(p[i].length===4){return null;}if(Math.max(p[i].length,3)!==3){return null;}var v=Number(p[i]);if(!inR(v,0,255)){return null;}n=n*256+v;}return n;} function ipStr(n){var o=[];for(var i=0;i!==4;i++){o.unshift(n%256);n=Math.floor(n\/256);}return o.join(\".\");} function maskToPrefix(m){var host=TWO32-m;for(var k=0;k!==33;k++){if(pow2(k)===host){return 32-k;}}return -1;} function calc(ip,prefix){var size=pow2(32-prefix);var net=ip-(ip%size);var bc=net+size-1;var first,last,usable;if(prefix===32){first=net;last=net;usable=1;}else if(prefix===31){first=net;last=bc;usable=2;}else{first=net+1;last=bc-1;usable=size-2;}return {net:net,bc:bc,first:first,last:last,usable:usable,total:size,mask:TWO32-size,wild:size-1,prefix:prefix};} function inNet(ip,base,prefix){var size=pow2(32-prefix);return ip-(ip%size)===base;} var KINDS=[[\"255.255.255.255\",32,\"Broadcast limitado \u2014 usado para falar com toda a rede local de uma vez\"],[\"0.0.0.0\",8,\"Reservado (este host) \u2014 n\u00e3o \u00e9 usado como endere\u00e7o de um dispositivo\"],[\"10.0.0.0\",8,\"Privado (RFC 1918) \u2014 usado em redes locais\"],[\"172.16.0.0\",12,\"Privado (RFC 1918) \u2014 usado em redes locais\"],[\"192.168.0.0\",16,\"Privado (RFC 1918) \u2014 usado em redes locais\"],[\"100.64.0.0\",10,\"CGNAT (RFC 6598) \u2014 compartilhado pelas operadoras entre v\u00e1rios clientes\"],[\"127.0.0.0\",8,\"Loopback \u2014 aponta para o pr\u00f3prio computador (localhost)\"],[\"169.254.0.0\",16,\"Link-local \u2014 atribu\u00eddo automaticamente quando o DHCP falha\"],[\"192.0.2.0\",24,\"Reservado para documenta\u00e7\u00e3o e exemplos\"],[\"198.51.100.0\",24,\"Reservado para documenta\u00e7\u00e3o e exemplos\"],[\"203.0.113.0\",24,\"Reservado para documenta\u00e7\u00e3o e exemplos\"],[\"198.18.0.0\",15,\"Reservado para testes de desempenho de rede\"],[\"224.0.0.0\",4,\"Multicast \u2014 envio para um grupo de dispositivos\"],[\"240.0.0.0\",4,\"Reservado para uso futuro\"]]; function kind(ip){for(var i=0;i!==KINDS.length;i++){if(inNet(ip,parseIP(KINDS[i][0]),KINDS[i][1])){return KINDS[i][2];}}return \"P\u00fablico \u2014 rote\u00e1vel na internet\";} function bits(n){var s=n.toString(2);while(s.length!==32){s=\"0\"+s;}return s;} function el(id){return document.getElementById(id);} function add(p,tag,text,style){var n=document.createElement(tag);if(text!==null){if(text!==undefined){n.textContent=String(text);}}if(style){n.setAttribute(\"style\",style);}p.appendChild(n);return n;} function fmt(n){return Number(n).toLocaleString(\"pt-BR\");} function clear(n){while(n.firstChild){n.removeChild(n.firstChild);}} function row(tb,label,value,strong){var tr=add(tb,\"tr\");add(tr,\"td\",label,\"padding:7px 10px;border-bottom:1px solid #e3eaf4;color:#3a4a63;\");add(tr,\"td\",value,\"padding:7px 10px;border-bottom:1px solid #e3eaf4;font-family:Consolas,Menlo,monospace;text-align:right;\"+(strong?\"font-weight:700;color:#0b3d91;\":\"\"));} function binLine(parent,label,n,prefix){var line=add(parent,\"div\",null,\"font-family:Consolas,Menlo,monospace;font-size:13.5px;margin-top:4px;word-break:break-all;\");add(line,\"span\",label,\"display:inline-block;min-width:92px;color:#3a4a63;font-family:Arial,Helvetica,sans-serif;\");var b=bits(n);for(var o=0;o!==4;o++){for(var i=0;i!==8;i++){var idx=o*8+i;var isNet=Math.max(idx,prefix-1)===prefix-1;add(line,\"span\",b.charAt(idx),isNet?\"color:#0b3d91;font-weight:700;\":\"color:#b06a00;\");}if(o!==3){add(line,\"span\",\".\",\"color:#9db4d6;\");}}} var state={ip:null,prefix:24}; function readInput(){var raw=String(el(\"hh-sn-ip\").value||\"\").trim();var ipPart=raw;var pre=null;var maskErr=false; if(raw.indexOf(\"\/\")!==-1){var sp=raw.split(\"\/\");ipPart=sp[0];var p=sp[1].trim();if(digitsOnly(p)){var pn=Number(p);if(inR(pn,0,32)){pre=pn;}else{maskErr=true;}}else{var mm=parseIP(p);var mp=mm===null?-1:maskToPrefix(mm);if(mp===-1){maskErr=true;}else{pre=mp;}}} else{var parts=raw.split(\" \").filter(function(x){return x!==\"\";});if(parts.length===2){ipPart=parts[0];var m2=parseIP(parts[1]);var mp2=m2===null?-1:maskToPrefix(m2);if(mp2===-1){maskErr=true;}else{pre=mp2;}}} return {ip:parseIP(ipPart),prefix:pre,maskErr:maskErr};} function render(){var out=el(\"hh-sn-out\");clear(out);var r=readInput(); if(r.prefix!==null){el(\"hh-sn-mask\").value=String(r.prefix);} var prefix=Number(el(\"hh-sn-mask\").value);state.prefix=prefix;state.ip=r.ip; var box=add(out,\"div\",null,\"padding:14px 16px;background:#ffffff;border:1px solid #dbe4f2;border-radius:10px;line-height:1.5;\"); if(r.ip===null){add(box,\"div\",\"Endere\u00e7o inv\u00e1lido. Use quatro n\u00fameros de 0 a 255 separados por pontos, como 192.168.1.10.\",\"color:#8f1f12;font-weight:700;\");buildDiv();return;} if(r.maskErr){add(box,\"div\",\"M\u00e1scara inv\u00e1lida: os bits 1 da m\u00e1scara precisam ser cont\u00ednuos, como em 255.255.255.0. Usando a m\u00e1scara escolhida na lista.\",\"color:#8a5000;font-weight:700;margin-bottom:8px;\");} var c=calc(r.ip,prefix); add(box,\"div\",ipStr(c.net)+\"\/\"+prefix,\"font-family:Consolas,Menlo,monospace;font-size:24px;font-weight:800;color:#0b3d91;\"); add(box,\"div\",kind(r.ip),\"margin:2px 0 10px;color:#3a4a63;font-size:14px;\"); var tb=add(add(box,\"table\",null,\"width:100%;border-collapse:collapse;font-size:14.5px;\"),\"tbody\"); row(tb,\"Endere\u00e7o de rede\",ipStr(c.net),true); if(prefix===32){row(tb,\"Endere\u00e7o \u00fanico\",ipStr(c.net),true);}else{row(tb,\"Primeiro IP utiliz\u00e1vel\",ipStr(c.first));row(tb,\"\u00daltimo IP utiliz\u00e1vel\",ipStr(c.last));row(tb,\"Broadcast\",prefix===31?\"n\u00e3o h\u00e1 (rede \/31)\":ipStr(c.bc));} row(tb,\"Hosts utiliz\u00e1veis\",fmt(c.usable),true);row(tb,\"Total de endere\u00e7os\",fmt(c.total));row(tb,\"M\u00e1scara de sub-rede\",ipStr(c.mask));row(tb,\"M\u00e1scara curinga (wildcard)\",ipStr(c.wild));row(tb,\"Nota\u00e7\u00e3o CIDR\",\"\/\"+prefix); var bin=add(box,\"div\",null,\"margin-top:12px;\");add(bin,\"div\",\"Em bin\u00e1rio \u2014 rede em azul, hosts em laranja\",\"font-weight:700;font-size:13.5px;\");binLine(bin,\"Endere\u00e7o\",r.ip,prefix);binLine(bin,\"M\u00e1scara\",c.mask,prefix); var notes=[];if(Math.max(prefix,30)===30){if(r.ip===c.net){notes.push(\"Este \u00e9 o endere\u00e7o de rede: ele identifica a rede inteira e n\u00e3o pode ser usado por um dispositivo.\");}if(r.ip===c.bc){notes.push(\"Este \u00e9 o endere\u00e7o de broadcast: ele fala com todos os dispositivos da rede e n\u00e3o pode ser usado por um deles.\");}} if(notes.length){var w=add(box,\"div\",null,\"margin-top:12px;padding:10px 12px;background:#fff8e8;border:1px solid #f0d9a8;border-radius:8px;font-size:13.5px;\");for(var i=0;i!==notes.length;i++){add(w,\"div\",notes[i]);}} buildDiv();} function buildDiv(){var sel=el(\"hh-sn-div\");var keep=sel.value;clear(sel);var prefix=state.prefix;add(sel,\"option\",\"\u2014 escolha \u2014\").setAttribute(\"value\",\"\");var maxP=Math.min(32,prefix+8);for(var np=prefix+1;np!==maxP+1;np++){var n=pow2(np-prefix);var o=add(sel,\"option\",\"Em \"+fmt(n)+\" sub-redes \/\"+np+\" (\"+fmt(pow2(32-np))+\" endere\u00e7os cada)\");o.setAttribute(\"value\",String(np));}if(keep!==\"\"){var ok=false;for(var k=0;k!==sel.options.length;k++){if(sel.options[k].value===keep){ok=true;}}sel.value=ok?keep:\"\";}renderSubs();} function renderSubs(){var box=el(\"hh-sn-subs\");clear(box);var v=el(\"hh-sn-div\").value;if(v===\"\"){return;}if(state.ip===null){return;}var np=Number(v);var base=calc(state.ip,state.prefix);var size=pow2(32-np);var n=pow2(np-state.prefix);var show=Math.min(n,64); var wrap=add(box,\"div\",null,\"overflow-x:auto;\");var t=add(wrap,\"table\",null,\"width:100%;border-collapse:collapse;font-size:13.5px;min-width:460px;\");var th=add(add(t,\"thead\"),\"tr\",null,\"background:#0b3d91;\");var heads=[\"Sub-rede\",\"Primeiro utiliz\u00e1vel\",\"\u00daltimo utiliz\u00e1vel\",\"Broadcast\"];for(var h=0;h!==4;h++){add(th,\"th\",heads[h],\"padding:8px 10px;color:#ffffff;text-align:left;\");}var tb=add(t,\"tbody\"); for(var i=0;i!==show;i++){var c=calc(base.net+i*size,np);var tr=add(tb,\"tr\",null,i%2===0?\"background:#f7fafd;\":\"background:#ffffff;\");add(tr,\"td\",ipStr(c.net)+\"\/\"+np,\"padding:7px 10px;border-bottom:1px solid #e3eaf4;font-family:Consolas,Menlo,monospace;font-weight:700;\");add(tr,\"td\",ipStr(c.first),\"padding:7px 10px;border-bottom:1px solid #e3eaf4;font-family:Consolas,Menlo,monospace;\");add(tr,\"td\",ipStr(c.last),\"padding:7px 10px;border-bottom:1px solid #e3eaf4;font-family:Consolas,Menlo,monospace;\");add(tr,\"td\",np===31?\"\u2014\":(np===32?\"\u2014\":ipStr(c.bc)),\"padding:7px 10px;border-bottom:1px solid #e3eaf4;font-family:Consolas,Menlo,monospace;\");} if(n!==show){add(box,\"div\",\"Mostrando as primeiras 64 de \"+fmt(n)+\" sub-redes.\",\"margin-top:6px;font-size:13px;color:#3a4a63;\");}} function init(){var sel=el(\"hh-sn-mask\");if(!sel){return;}if(sel.getAttribute(\"data-hh-ready\")===\"1\"){return;}sel.setAttribute(\"data-hh-ready\",\"1\"); for(var p=32;p!==-1;p--){var o=add(sel,\"option\",\"\/\"+p+\" \u2014 \"+ipStr(TWO32-pow2(32-p)));o.setAttribute(\"value\",String(p));}sel.value=\"24\"; var timer=null;var go=function(){if(timer){clearTimeout(timer);}timer=setTimeout(render,120);}; el(\"hh-sn-ip\").addEventListener(\"input\",go);el(\"hh-sn-ip\").addEventListener(\"change\",go); sel.addEventListener(\"change\",function(){var ip=el(\"hh-sn-ip\");var v=String(ip.value||\"\");if(v.indexOf(\"\/\")!==-1){ip.value=v.split(\"\/\")[0]+\"\/\"+sel.value;}else{var sp=v.trim().split(\" \").filter(function(x){return x!==\"\";});if(sp.length===2){ip.value=sp[0]+\"\/\"+sel.value;}}render();}); el(\"hh-sn-div\").addEventListener(\"change\",renderSubs);render();} if(document.readyState===\"loading\"){document.addEventListener(\"DOMContentLoaded\",init);}else{init();} })();<\/script>\n\n\n\n<h2 class=\"wp-block-heading\">O que \u00e9 a m\u00e1scara de sub-rede<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Um endere\u00e7o IP tem duas partes, como um endere\u00e7o de rua: <strong>a rede<\/strong> \u2014 a rua \u2014 e <strong>o dispositivo<\/strong> \u2014 o n\u00famero da casa. Como explicamos no guia sobre <a href=\"https:\/\/www.homehost.com.br\/blog\/internet\/o-que-e-endereco-ip\/\">o que \u00e9 endere\u00e7o IP<\/a>, todos os aparelhos da sua casa costumam ter IPs que come\u00e7am iguais e mudam s\u00f3 no final: eles est\u00e3o na mesma rua.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>A m\u00e1scara de sub-rede \u00e9 o que diz onde termina a rua e come\u00e7a o n\u00famero.<\/strong> Na m\u00e1scara <code>255.255.255.0<\/code>, cada <code>255<\/code> marca uma parte que pertence \u00e0 rede, e o <code>0<\/code> marca a parte livre para os dispositivos. Com o IP <code>192.168.1.10<\/code>, a rede \u00e9 <code>192.168.1<\/code> e o dispositivo \u00e9 o <code>10<\/code>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">O que significa o \/24: a nota\u00e7\u00e3o CIDR<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Por baixo, um endere\u00e7o IPv4 tem <strong>32 bits<\/strong> \u2014 zeros e uns \u2014, e a m\u00e1scara tamb\u00e9m. <strong>Cada 255 da m\u00e1scara s\u00e3o oito bits 1 seguidos<\/strong>: <code>11111111<\/code>. A m\u00e1scara <code>255.255.255.0<\/code> s\u00e3o, portanto, <strong>24 bits 1<\/strong> seguidos de <strong>8 bits 0<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>A nota\u00e7\u00e3o CIDR conta esses bits 1.<\/strong> Em vez de escrever <code>255.255.255.0<\/code>, escreve-se <code>\/24<\/code>. \u00c9 o que o comando <code>ip addr<\/code> mostra no Linux \u2014 como explicamos no guia do <a href=\"https:\/\/www.homehost.com.br\/blog\/tutoriais\/linux\/comando-ip-no-linux\/\">comando ip<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>A conta do tamanho da rede sai da\u00ed:<\/strong> os bits que sobram para os dispositivos s\u00e3o <code>32 \u2212 24 = 8<\/code>, e 8 bits formam <code>2\u2078 = 256<\/code> combina\u00e7\u00f5es \u2014 os 256 endere\u00e7os da rede. <strong>Cada bit a mais no prefixo divide a rede pela metade:<\/strong> um <code>\/25<\/code> tem 128 endere\u00e7os, um <code>\/26<\/code>, 64.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Tabela de m\u00e1scaras de sub-rede<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Todas as m\u00e1scaras de \/8 a \/32, com a m\u00e1scara curinga \u2014 usada em listas de acesso de roteadores e firewalls \u2014 e o n\u00famero de hosts de cada uma:<\/p>\n\n\n\n<div style=\"overflow-x:auto; margin:24px 0;\">\n<table style=\"width:100%; border-collapse:collapse; font-family:Arial, Helvetica, sans-serif; font-size:14.5px; min-width:600px;\">\n<thead>\n<tr style=\"background-color:#0b3d91; color:#ffffff; text-align:left;\">\n<th style=\"padding:11px 12px; border:1px solid #0b3d91; color:#ffffff;\">Prefixo<\/th>\n<th style=\"padding:11px 12px; border:1px solid #0b3d91; color:#ffffff;\">M\u00e1scara<\/th>\n<th style=\"padding:11px 12px; border:1px solid #0b3d91; color:#ffffff;\">Curinga<\/th>\n<th style=\"padding:11px 12px; border:1px solid #0b3d91; color:#ffffff;\">Endere\u00e7os<\/th>\n<th style=\"padding:11px 12px; border:1px solid #0b3d91; color:#ffffff;\">Hosts utiliz\u00e1veis<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"background-color:#eaf1fb;\"><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-weight:700; color:#0b3d91; font-family:Consolas,Menlo,monospace;\">\/8<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">255.0.0.0<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">0.255.255.255<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">16.777.216<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">16.777.214<\/td><\/tr>\n<tr style=\"background-color:#ffffff;\"><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-weight:700; color:#0b3d91; font-family:Consolas,Menlo,monospace;\">\/9<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">255.128.0.0<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">0.127.255.255<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">8.388.608<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">8.388.606<\/td><\/tr>\n<tr style=\"background-color:#f7fafd;\"><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-weight:700; color:#0b3d91; font-family:Consolas,Menlo,monospace;\">\/10<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">255.192.0.0<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">0.63.255.255<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">4.194.304<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">4.194.302<\/td><\/tr>\n<tr style=\"background-color:#ffffff;\"><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-weight:700; color:#0b3d91; font-family:Consolas,Menlo,monospace;\">\/11<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">255.224.0.0<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">0.31.255.255<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">2.097.152<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">2.097.150<\/td><\/tr>\n<tr style=\"background-color:#f7fafd;\"><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-weight:700; color:#0b3d91; font-family:Consolas,Menlo,monospace;\">\/12<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">255.240.0.0<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">0.15.255.255<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">1.048.576<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">1.048.574<\/td><\/tr>\n<tr style=\"background-color:#ffffff;\"><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-weight:700; color:#0b3d91; font-family:Consolas,Menlo,monospace;\">\/13<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">255.248.0.0<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">0.7.255.255<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">524.288<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">524.286<\/td><\/tr>\n<tr style=\"background-color:#f7fafd;\"><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-weight:700; color:#0b3d91; font-family:Consolas,Menlo,monospace;\">\/14<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">255.252.0.0<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">0.3.255.255<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">262.144<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">262.142<\/td><\/tr>\n<tr style=\"background-color:#ffffff;\"><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-weight:700; color:#0b3d91; font-family:Consolas,Menlo,monospace;\">\/15<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">255.254.0.0<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">0.1.255.255<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">131.072<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">131.070<\/td><\/tr>\n<tr style=\"background-color:#eaf1fb;\"><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-weight:700; color:#0b3d91; font-family:Consolas,Menlo,monospace;\">\/16<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">255.255.0.0<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">0.0.255.255<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">65.536<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">65.534<\/td><\/tr>\n<tr style=\"background-color:#ffffff;\"><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-weight:700; color:#0b3d91; font-family:Consolas,Menlo,monospace;\">\/17<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">255.255.128.0<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">0.0.127.255<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">32.768<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">32.766<\/td><\/tr>\n<tr style=\"background-color:#f7fafd;\"><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-weight:700; color:#0b3d91; font-family:Consolas,Menlo,monospace;\">\/18<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">255.255.192.0<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">0.0.63.255<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">16.384<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">16.382<\/td><\/tr>\n<tr style=\"background-color:#ffffff;\"><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-weight:700; color:#0b3d91; font-family:Consolas,Menlo,monospace;\">\/19<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">255.255.224.0<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">0.0.31.255<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">8.192<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">8.190<\/td><\/tr>\n<tr style=\"background-color:#f7fafd;\"><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-weight:700; color:#0b3d91; font-family:Consolas,Menlo,monospace;\">\/20<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">255.255.240.0<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">0.0.15.255<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">4.096<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">4.094<\/td><\/tr>\n<tr style=\"background-color:#ffffff;\"><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-weight:700; color:#0b3d91; font-family:Consolas,Menlo,monospace;\">\/21<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">255.255.248.0<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">0.0.7.255<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">2.048<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">2.046<\/td><\/tr>\n<tr style=\"background-color:#f7fafd;\"><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-weight:700; color:#0b3d91; font-family:Consolas,Menlo,monospace;\">\/22<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">255.255.252.0<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">0.0.3.255<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">1.024<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">1.022<\/td><\/tr>\n<tr style=\"background-color:#ffffff;\"><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-weight:700; color:#0b3d91; font-family:Consolas,Menlo,monospace;\">\/23<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">255.255.254.0<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">0.0.1.255<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">512<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">510<\/td><\/tr>\n<tr style=\"background-color:#eaf1fb;\"><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-weight:700; color:#0b3d91; font-family:Consolas,Menlo,monospace;\">\/24<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">255.255.255.0<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">0.0.0.255<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">256<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">254<\/td><\/tr>\n<tr style=\"background-color:#ffffff;\"><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-weight:700; color:#0b3d91; font-family:Consolas,Menlo,monospace;\">\/25<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">255.255.255.128<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">0.0.0.127<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">128<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">126<\/td><\/tr>\n<tr style=\"background-color:#f7fafd;\"><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-weight:700; color:#0b3d91; font-family:Consolas,Menlo,monospace;\">\/26<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">255.255.255.192<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">0.0.0.63<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">64<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">62<\/td><\/tr>\n<tr style=\"background-color:#ffffff;\"><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-weight:700; color:#0b3d91; font-family:Consolas,Menlo,monospace;\">\/27<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">255.255.255.224<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">0.0.0.31<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">32<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">30<\/td><\/tr>\n<tr style=\"background-color:#f7fafd;\"><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-weight:700; color:#0b3d91; font-family:Consolas,Menlo,monospace;\">\/28<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">255.255.255.240<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">0.0.0.15<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">16<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">14<\/td><\/tr>\n<tr style=\"background-color:#ffffff;\"><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-weight:700; color:#0b3d91; font-family:Consolas,Menlo,monospace;\">\/29<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">255.255.255.248<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">0.0.0.7<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">8<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">6<\/td><\/tr>\n<tr style=\"background-color:#f7fafd;\"><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-weight:700; color:#0b3d91; font-family:Consolas,Menlo,monospace;\">\/30<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">255.255.255.252<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">0.0.0.3<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">4<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">2<\/td><\/tr>\n<tr style=\"background-color:#ffffff;\"><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-weight:700; color:#0b3d91; font-family:Consolas,Menlo,monospace;\">\/31<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">255.255.255.254<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">0.0.0.1<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">2<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">2<\/td><\/tr>\n<tr style=\"background-color:#f7fafd;\"><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-weight:700; color:#0b3d91; font-family:Consolas,Menlo,monospace;\">\/32<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">255.255.255.255<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; font-family:Consolas,Menlo,monospace;\">0.0.0.0<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">1<\/td><td style=\"padding:9px 12px; border:1px solid #dde6ef; text-align:right;\">1<\/td><\/tr>\n<\/tbody>\n<\/table>\n<p style=\"margin:8px 0 0; font-size:13px; color:#3a4a63; font-family:Arial, Helvetica, sans-serif; line-height:1.5;\">Em destaque, os tr\u00eas prefixos mais comuns. Nas redes \/31 os dois endere\u00e7os s\u00e3o utiliz\u00e1veis (liga\u00e7\u00f5es ponto a ponto), e uma \/32 representa um \u00fanico endere\u00e7o.<\/p>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Como calcular a sub-rede na m\u00e3o<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Veja o c\u00e1lculo do IP <code>192.168.1.100\/26<\/code>, passo a passo:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>O tamanho do bloco.<\/strong> Sobram <code>32 \u2212 26 = 6<\/code> bits para os dispositivos, e <code>2\u2076 = 64<\/code>. Cada rede \/26 tem <strong>64 endere\u00e7os<\/strong>.<\/li>\n\n\n\n<li><strong>O endere\u00e7o de rede.<\/strong> As redes \/26 come\u00e7am nos m\u00faltiplos de 64 do \u00faltimo n\u00famero: 0, 64, 128 e 192. O 100 fica entre 64 e 127, ent\u00e3o <strong>a rede \u00e9 <code>192.168.1.64<\/code><\/strong>.<\/li>\n\n\n\n<li><strong>O broadcast.<\/strong> \u00c9 o \u00faltimo endere\u00e7o do bloco: <code>64 + 64 \u2212 1 = 127<\/code>, ou seja, <strong><code>192.168.1.127<\/code><\/strong>.<\/li>\n\n\n\n<li><strong>A faixa utiliz\u00e1vel.<\/strong> Tudo entre os dois: de <strong><code>192.168.1.65<\/code> a <code>192.168.1.126<\/code><\/strong> \u2014 <strong>62 dispositivos<\/strong>.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Confira na calculadora acima: digite <code>192.168.1.100\/26<\/code> e o resultado \u00e9 o mesmo.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Como dividir uma rede em sub-redes<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Dividir uma rede \u00e9 aumentar o prefixo.<\/strong> Cada bit a mais divide a rede em duas partes iguais; dois bits a mais, em quatro.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Por exemplo, a rede <code>192.168.1.0\/24<\/code> \u2014 256 endere\u00e7os \u2014 dividida em <strong>quatro sub-redes<\/strong> precisa de 2 bits a mais, e vira quatro redes <strong>\/26<\/strong> de 64 endere\u00e7os cada:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>192.168.1.0\/26<\/code> \u2014 dispositivos de <code>.1<\/code> a <code>.62<\/code><\/li>\n\n\n\n<li><code>192.168.1.64\/26<\/code> \u2014 de <code>.65<\/code> a <code>.126<\/code><\/li>\n\n\n\n<li><code>192.168.1.128\/26<\/code> \u2014 de <code>.129<\/code> a <code>.190<\/code><\/li>\n\n\n\n<li><code>192.168.1.192\/26<\/code> \u2014 de <code>.193<\/code> a <code>.254<\/code><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u00c9 assim que uma empresa separa a rede do escrit\u00f3rio da rede de visitantes, das c\u00e2meras ou dos servidores.<\/strong> Na calculadora, escolha a op\u00e7\u00e3o em &#8220;Dividir esta rede&#8221; para ver a lista de qualquer divis\u00e3o.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Por que dois endere\u00e7os n\u00e3o podem ser usados<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Em quase toda rede, o primeiro e o \u00faltimo endere\u00e7o s\u00e3o reservados:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>O primeiro \u00e9 o endere\u00e7o da rede<\/strong> \u2014 ele identifica a rede inteira, como o nome da rua.<\/li>\n\n\n\n<li><strong>O \u00faltimo \u00e9 o broadcast<\/strong> \u2014 uma mensagem enviada para ele chega a todos os dispositivos da rede de uma vez.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u00c9 por isso que um \/24 tem 256 endere\u00e7os, mas s\u00f3 254 hosts.<\/strong> As exce\u00e7\u00f5es s\u00e3o as duas menores redes: <strong>o \/31<\/strong>, usado em liga\u00e7\u00f5es diretas entre dois roteadores, em que os dois endere\u00e7os s\u00e3o utiliz\u00e1veis, e <strong>o \/32<\/strong>, que representa um \u00fanico endere\u00e7o \u2014 comum em regras de firewall para liberar ou bloquear um IP espec\u00edfico.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Endere\u00e7os que voc\u00ea vai reconhecer<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A calculadora tamb\u00e9m mostra o tipo de cada endere\u00e7o. Os mais comuns:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>192.168.x.x<\/code>, <code>10.x.x.x<\/code> e <code>172.16.x.x<\/code> a <code>172.31.x.x<\/code><\/strong> \u2014 <strong>privados<\/strong>: usados dentro de casas e empresas, nunca na internet.<\/li>\n\n\n\n<li><strong><code>100.64.x.x<\/code> a <code>100.127.x.x<\/code><\/strong> \u2014 <strong>CGNAT<\/strong>: a faixa que as operadoras usam quando colocam v\u00e1rios clientes atr\u00e1s do mesmo IP p\u00fablico.<\/li>\n\n\n\n<li><strong><code>127.0.0.1<\/code><\/strong> \u2014 <strong>loopback<\/strong>, o pr\u00f3prio computador.<\/li>\n\n\n\n<li><strong><code>169.254.x.x<\/code><\/strong> \u2014 <strong>link-local<\/strong>: o endere\u00e7o que o computador atribui a si mesmo quando n\u00e3o consegue um IP do roteador. <strong>Se voc\u00ea v\u00ea um desses, o DHCP falhou.<\/strong><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Perguntas frequentes<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>O que \u00e9 m\u00e1scara de sub-rede?<\/strong><br>\u00c9 o n\u00famero que divide um endere\u00e7o IP em duas partes: a rede e o dispositivo. Na m\u00e1scara 255.255.255.0, os tr\u00eas primeiros blocos identificam a rede, e o \u00faltimo fica livre para os dispositivos \u2014 254 deles.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>O que significa o \/24 depois do IP?<\/strong><br>\u00c9 a nota\u00e7\u00e3o CIDR: o n\u00famero de bits que identificam a rede. Um \/24 tem 24 bits de rede, o mesmo que a m\u00e1scara 255.255.255.0, e deixa 256 endere\u00e7os na rede, dos quais 254 podem ser usados por dispositivos.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Qual a m\u00e1scara de um \/24, \/16 e \/8?<\/strong><br>O \/24 \u00e9 255.255.255.0, com 254 hosts; o \/16 \u00e9 255.255.0.0, com 65.534 hosts; e o \/8 \u00e9 255.0.0.0, com 16.777.214 hosts. A tabela deste artigo mostra todas as m\u00e1scaras de \/8 a \/32.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Como calcular quantos hosts uma rede tem?<\/strong><br>Subtraia o prefixo de 32, eleve 2 a esse resultado e tire 2 \u2014 o endere\u00e7o de rede e o broadcast. Num \/26: 32 \u2212 26 = 6, 2\u2076 = 64, e 64 \u2212 2 = 62 hosts.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Por que um \/24 tem 254 hosts e n\u00e3o 256?<\/strong><br>Porque dois endere\u00e7os s\u00e3o reservados: o primeiro identifica a rede e o \u00faltimo \u00e9 o broadcast, que fala com todos os dispositivos de uma vez. Sobram 254 para computadores, celulares e outros aparelhos.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>O que \u00e9 m\u00e1scara curinga (wildcard)?<\/strong><br>\u00c9 o inverso da m\u00e1scara de sub-rede: onde a m\u00e1scara tem 255, a curinga tem 0, e vice-versa. A curinga de 255.255.255.0 \u00e9 0.0.0.255. Ela \u00e9 usada em listas de acesso de roteadores e firewalls.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>O que \u00e9 um endere\u00e7o 169.254?<\/strong><br>\u00c9 um endere\u00e7o link-local, que o computador atribui a si mesmo quando n\u00e3o consegue receber um IP do roteador pelo DHCP. Na pr\u00e1tica, ele indica que a conex\u00e3o com a rede falhou.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Como dividir uma rede \/24 em 4 sub-redes?<\/strong><br>Aumente o prefixo em 2 bits, para \/26. A rede 192.168.1.0\/24 vira quatro redes de 64 endere\u00e7os: 192.168.1.0\/26, 192.168.1.64\/26, 192.168.1.128\/26 e 192.168.1.192\/26, cada uma com 62 hosts.<\/p>\n\n\n\n<script type=\"application\/ld+json\">\n{\n\"@context\": \"https:\/\/schema.org\",\n\"@type\": \"FAQPage\",\n\"mainEntity\": [\n{\"@type\":\"Question\",\"name\":\"O que \u00e9 m\u00e1scara de sub-rede?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"\u00c9 o n\u00famero que divide um endere\u00e7o IP em duas partes: a rede e o dispositivo. Na m\u00e1scara 255.255.255.0, os tr\u00eas primeiros blocos identificam a rede, e o \u00faltimo fica livre para os dispositivos, 254 deles.\"}},\n{\"@type\":\"Question\",\"name\":\"O que significa o \/24 depois do IP?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"\u00c9 a nota\u00e7\u00e3o CIDR: o n\u00famero de bits que identificam a rede. Um \/24 tem 24 bits de rede, o mesmo que a m\u00e1scara 255.255.255.0, e deixa 256 endere\u00e7os na rede, dos quais 254 podem ser usados por dispositivos.\"}},\n{\"@type\":\"Question\",\"name\":\"Qual a m\u00e1scara de um \/24, \/16 e \/8?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"O \/24 \u00e9 255.255.255.0, com 254 hosts; o \/16 \u00e9 255.255.0.0, com 65.534 hosts; e o \/8 \u00e9 255.0.0.0, com 16.777.214 hosts.\"}},\n{\"@type\":\"Question\",\"name\":\"Como calcular quantos hosts uma rede tem?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Subtraia o prefixo de 32, eleve 2 a esse resultado e tire 2, que s\u00e3o o endere\u00e7o de rede e o broadcast. Num \/26: 32 menos 26 \u00e9 6, 2 elevado a 6 \u00e9 64, e 64 menos 2 s\u00e3o 62 hosts.\"}},\n{\"@type\":\"Question\",\"name\":\"Por que um \/24 tem 254 hosts e n\u00e3o 256?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Porque dois endere\u00e7os s\u00e3o reservados: o primeiro identifica a rede e o \u00faltimo \u00e9 o broadcast, que fala com todos os dispositivos de uma vez. Sobram 254 para computadores, celulares e outros aparelhos.\"}},\n{\"@type\":\"Question\",\"name\":\"O que \u00e9 m\u00e1scara curinga (wildcard)?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"\u00c9 o inverso da m\u00e1scara de sub-rede: onde a m\u00e1scara tem 255, a curinga tem 0, e vice-versa. A curinga de 255.255.255.0 \u00e9 0.0.0.255. Ela \u00e9 usada em listas de acesso de roteadores e firewalls.\"}},\n{\"@type\":\"Question\",\"name\":\"O que \u00e9 um endere\u00e7o 169.254?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"\u00c9 um endere\u00e7o link-local, que o computador atribui a si mesmo quando n\u00e3o consegue receber um IP do roteador pelo DHCP. Na pr\u00e1tica, ele indica que a conex\u00e3o com a rede falhou.\"}},\n{\"@type\":\"Question\",\"name\":\"Como dividir uma rede \/24 em 4 sub-redes?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Aumente o prefixo em 2 bits, para \/26. A rede 192.168.1.0\/24 vira quatro redes de 64 endere\u00e7os: 192.168.1.0\/26, 192.168.1.64\/26, 192.168.1.128\/26 e 192.168.1.192\/26, cada uma com 62 hosts.\"}}\n]\n}\n<\/script>\n\n\n\n<div style=\"max-width:760px; margin:32px auto; background:linear-gradient(135deg,#1a73e8 0%,#0b3d91 100%); border-radius:16px; padding:32px 28px; font-family:Arial, Helvetica, sans-serif; color:#fff; box-shadow:0 10px 30px rgba(26,115,232,.25);\">\n<div style=\"display:flex; align-items:flex-start; gap:16px; flex-wrap:wrap;\">\n<div style=\"flex:0 0 auto; display:inline-flex; align-items:center; justify-content:center; width:52px; height:52px; border-radius:12px; background:rgba(255,255,255,.18);\">\n<svg width=\"28\" height=\"28\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"#fff\" stroke-width=\"2\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><rect x=\"2\" y=\"2\" width=\"20\" height=\"8\" rx=\"2\"><\/rect><rect x=\"2\" y=\"14\" width=\"20\" height=\"8\" rx=\"2\"><\/rect><line x1=\"6\" y1=\"6\" x2=\"6.01\" y2=\"6\"><\/line><line x1=\"6\" y1=\"18\" x2=\"6.01\" y2=\"18\"><\/line><\/svg>\n<\/div>\n<div style=\"flex:1 1 320px; min-width:260px;\">\n<div style=\"font-weight:800; line-height:1.25; margin-bottom:8px; font-size:19px; color:#ffffff;\">Seu pr\u00f3prio servidor, com a rede sob seu controle<\/div>\n<p style=\"margin:0 0 18px; line-height:1.6; color:#ffffff;\">Nos servidores VPS da Homehost, voc\u00ea tem acesso root para configurar a rede, o firewall e os servi\u00e7os do jeito que precisar \u2014 em data centers no Brasil, com suporte em portugu\u00eas.<\/p>\n<a href=\"https:\/\/www.homehost.com.br\/servidores-vps\/\" style=\"display:inline-flex; align-items:center; gap:8px; background:#fff; color:#0b3d91; font-weight:700; text-decoration:none; padding:13px 26px; border-radius:10px; box-shadow:0 4px 12px rgba(0,0,0,.15);\">\nConhecer os servidores VPS\n<svg width=\"18\" height=\"18\" viewBox=\"0 0 24 24\" fill=\"none\" stroke=\"#0b3d91\" stroke-width=\"2.5\" stroke-linecap=\"round\" stroke-linejoin=\"round\" aria-hidden=\"true\"><path d=\"M5 12h14M13 6l6 6-6 6\"><\/path><\/svg>\n<\/a>\n<\/div>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Conclus\u00e3o<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A m\u00e1scara de sub-rede responde a uma pergunta simples: <strong>quais endere\u00e7os est\u00e3o na mesma rede?<\/strong> O \/24 do comando ip e o 255.255.255.0 das configura\u00e7\u00f5es de rede dizem a mesma coisa \u2014 24 bits de rede, 256 endere\u00e7os, 254 dispositivos \u2014, e cada bit a mais no prefixo divide a rede pela metade.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Com essa regra, todo o resto vira conta: o endere\u00e7o de rede \u00e9 o in\u00edcio do bloco, o broadcast \u00e9 o fim, e os dispositivos ficam no meio. <strong>A calculadora acima faz essas contas para qualquer endere\u00e7o<\/strong> \u2014 e a tabela mostra, de uma vez, o tamanho de cada m\u00e1scara de \/8 a \/32.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Todo endere\u00e7o IP vem acompanhado de uma m\u00e1scara \u2014 o 255.255.255.0 que aparece na configura\u00e7\u00e3o de rede, ou o \/24 que o comando ip addr mostra no Linux. \u00c9 ela que diz quais endere\u00e7os fazem parte da mesma rede, quantos dispositivos cabem nela e onde a rede come\u00e7a e termina. Este guia traz uma calculadora [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":18372,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_helpful_status":1,"_lmt_disableupdate":"","_lmt_disable":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[203],"tags":[],"class_list":["post-18371","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-internet"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>M\u00e1scara de sub-rede e CIDR: tabela completa e calculadora de IP | Homehost<\/title>\n<meta name=\"description\" content=\"Calcule rede, broadcast, faixa de IPs e hosts de qualquer endere\u00e7o. 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