{"id":33411,"date":"2019-10-09T10:56:20","date_gmt":"2019-10-09T07:26:20","guid":{"rendered":"https:\/\/airoserver.com\/?p=1534"},"modified":"2022-04-04T09:21:18","modified_gmt":"2022-04-04T04:51:18","slug":"what-is-subnet-mask","status":"publish","type":"post","link":"https:\/\/airoserver.com\/fr\/dedie\/quest-ce-que-le-masque-de-sous-reseau\/","title":{"rendered":"Qu'est-ce que le masque de sous-r\u00e9seau ?"},"content":{"rendered":"<p>Dans notre dernier article, nous avons parl\u00e9 de <a href=\"https:\/\/airoserver.com\/fr\/dedie\/classes-dadresses-ip\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Classes IP (s&#039;ouvre dans un nouvel onglet)\">Classes IP<\/a> et nous avons dit que chaque IP se compose d'un ID de r\u00e9seau et d'un ID d'h\u00f4te. Voyons maintenant comment distinguer l'ID r\u00e9seau (les octets fixes) de l'ID h\u00f4te (les octets variables). Pour ce faire, nous devons d'abord expliquer ce qu'est un masque de sous-r\u00e9seau.<\/p>\r\n\r\n\r\n\r\n<h4 class=\"wp-block-heading\"><strong>Masque de sous-r\u00e9seau :<\/strong><\/h4>\r\n\r\n\r\n\r\n<p>En fait, le masque de sous-r\u00e9seau nous aide \u00e0 distinguer l'ID du r\u00e9seau et l'ID de l'h\u00f4te dans une IP. Comme pour l'IPv4, le masque de sous-r\u00e9seau a une taille de 32 bits. En d'autres termes, il comporte 4 octets, chaque octet contenant 8 bits. De gauche \u00e0 droite, chaque bit peut prendre la valeur 0 ou 1. Tous les bits qui ont la valeur 1 indiquent l'ID du r\u00e9seau et tous les bits qui ont la valeur 0 indiquent l'ID de l'h\u00f4te. Cela signifie qu'un masque de sous-r\u00e9seau en <a href=\"https:\/\/en.wikipedia.org\/wiki\/Binary_number\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"binaire (s&#039;ouvre dans un nouvel onglet)\">binaire<\/a> est \u00e0 peu pr\u00e8s la suivante :<\/p>\r\n\r\n\r\n\r\n<p><strong>11111111 00000000 00000000 00000000<\/strong><\/p>\r\n\r\n\r\n\r\n<p>Maintenant, si nous voulons afficher le masque de sous-r\u00e9seau exact en <a href=\"https:\/\/en.wikipedia.org\/wiki\/Decimal\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"D\u00e9cimale (s&#039;ouvre dans un nouvel onglet)\">d\u00e9cimal<\/a>Ce sera quelque chose comme \u00e7a :<\/p>\r\n\r\n\r\n\r\n<p><strong>255.0.0.0<\/strong><\/p>\r\n\r\n\r\n\r\n<p>Comme vous l'avez peut-\u00eatre compris dans l'exemple ci-dessus, pour chaque octet fixe d'une IP, l'octet est 255 dans le masque de sous-r\u00e9seau.<\/p>\r\n\r\n\r\n\r\n<p><strong>Autre exemple :<\/strong> 255.255.255.0<\/p>\r\n\r\n\r\n\r\n<p>Ce masque de sous-r\u00e9seau montre que cette IP est une IP de classe C car les trois premiers octets de notre masque de sous-r\u00e9seau sont 255, ce qui signifie qu'il s'agit d'octets fixes. Dans l'article sur les classes IP, nous avons dit que si les trois premiers octets d'une IP indiquent notre identifiant de r\u00e9seau, cette IP est de classe C.<\/p>\r\n\r\n\r\n\r\n<p>Nous devons mentionner que tous les octets d'un masque (en d\u00e9cimal) qui nous indiquent l'ID du r\u00e9seau n'ont pas toujours une taille de 255. Cela ne se produit que lorsque les 8 bits d'un octet ont une valeur de 1. Si les octets ont une valeur inf\u00e9rieure \u00e0 255, cela signifie que l'octet entier n'est pas notre ID de r\u00e9seau et que nous devons convertir le masque de sous-r\u00e9seau d\u00e9cimal en binaire pour le d\u00e9terminer. Regardez l'image ci-dessous pour quelques exemples :<\/p>\r\n\r\n\r\n\r\n<div class=\"wp-block-image\">\r\n<figure class=\"aligncenter\"><img decoding=\"async\" class=\"wp-image-1539\" src=\"https:\/\/airoserver.com\/wp-content\/uploads\/2019\/10\/EN-binary-subnet-mask.png\" alt=\"Masque de sous-r\u00e9seau\" \/><\/figure>\r\n<\/div>\r\n\r\n\r\n\r\n<p>La premi\u00e8re colonne indique le nombre de bits dont la valeur est de 1. Ainsi, \/8 correspond \u00e0 la classe A, \/16 \u00e0 la classe B et \/24 \u00e0 la classe C.<\/p>","protected":false},"excerpt":{"rendered":"<p>In our last post, we explained about IP classes and we said every IP consists of Network ID and Host ID. Now let&#8217;s see how we can distinguish Network ID (the fixed octets) from Host ID (the variable octets).For this matter, we have to explain about subnet mask first. Subnet mask: In fact, Subnet mask [&hellip;]<\/p>","protected":false},"author":5,"featured_media":33968,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[179,176,182,178],"tags":[85,184],"class_list":["post-33411","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-airoserver","category-dedicated","category-shared-hosting","category-airo-vps","tag-airoserver","tag-network"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What is Subnet mask?<\/title>\n<meta name=\"description\" content=\"Subnet mask is something to help us distinguish Network ID and Host ID in an IP. Like an IPv4, subnet mask is 32 bit in size.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/airoserver.com\/fr\/dedie\/quest-ce-que-le-masque-de-sous-reseau\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is Subnet mask?\" \/>\n<meta property=\"og:description\" content=\"Subnet mask is something to help us distinguish Network ID and Host ID in an IP. Like an IPv4, subnet mask is 32 bit in size.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/airoserver.com\/fr\/dedie\/quest-ce-que-le-masque-de-sous-reseau\/\" \/>\n<meta property=\"og:site_name\" content=\"Airoserver | Cloud Hosting Solutions\" \/>\n<meta property=\"article:published_time\" content=\"2019-10-09T07:26:20+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-04-04T04:51:18+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/airoserver.com\/wp-content\/uploads\/2019\/10\/What-is-Subnet-mask-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"700\" \/>\n\t<meta property=\"og:image:height\" content=\"321\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"SEO Team\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"SEO Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/airoserver.com\/dedicated\/what-is-subnet-mask\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/airoserver.com\/dedicated\/what-is-subnet-mask\/\"},\"author\":{\"name\":\"SEO Team\",\"@id\":\"https:\/\/airoserver.com\/#\/schema\/person\/62f9488eeb65ea1e571178292d4bb897\"},\"headline\":\"What is Subnet mask?\",\"datePublished\":\"2019-10-09T07:26:20+00:00\",\"dateModified\":\"2022-04-04T04:51:18+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/airoserver.com\/dedicated\/what-is-subnet-mask\/\"},\"wordCount\":339,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/airoserver.com\/#organization\"},\"keywords\":[\"airoserver\",\"Network\"],\"articleSection\":[\"AiroServer\",\"Dedicated\",\"Shared Hosting\",\"VPS\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/airoserver.com\/dedicated\/what-is-subnet-mask\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/airoserver.com\/dedicated\/what-is-subnet-mask\/\",\"url\":\"https:\/\/airoserver.com\/dedicated\/what-is-subnet-mask\/\",\"name\":\"What is Subnet mask?\",\"isPartOf\":{\"@id\":\"https:\/\/airoserver.com\/#website\"},\"datePublished\":\"2019-10-09T07:26:20+00:00\",\"dateModified\":\"2022-04-04T04:51:18+00:00\",\"description\":\"Subnet mask is something to help us distinguish Network ID and Host ID in an IP. 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