{"id":317,"date":"2026-08-27T09:26:39","date_gmt":"2026-08-27T09:26:39","guid":{"rendered":"https:\/\/devmath.fr\/blog\/calcul-masque-reseau\/"},"modified":"2026-08-27T09:26:39","modified_gmt":"2026-08-27T09:26:39","slug":"calcul-masque-reseau","status":"publish","type":"post","link":"https:\/\/devmath.fr\/blog\/calcul-masque-reseau\/","title":{"rendered":"Calcul mask : comprendre et appliquer les masques en r\u00e9seau"},"content":{"rendered":"<p class=\"wp-block-paragraph\"><div class=\"en-bref\">\n<h3 style=\"margin-top:0px !important; padding-top:0px !important;\"> L&rsquo;article en bref<\/h3>\n<p>Ma\u00eetriser le calcul mask est une \u00e9tape incontournable pour d\u00e9ployer un r\u00e9seau IP efficace et optimis\u00e9. Nous explorons comment comprendre et appliquer les masques en r\u00e9seau, pour segmenter et s\u00e9curiser les infrastructures num\u00e9riques.<\/p>\n<ul>\n<li> <strong>Principes cl\u00e9s du masque r\u00e9seau :<\/strong> Comprendre la distinction entre parties r\u00e9seau et h\u00f4te<\/li>\n<li> <strong>M\u00e9thodes de subnetting :<\/strong> Diff\u00e9rences entre masques \u00e0 longueur fixe et variable<\/li>\n<li> <strong>Calculs binaires essentiels :<\/strong> Conversion binaire et op\u00e9rations logiques pour d\u00e9terminer l\u2019adresse r\u00e9seau<\/li>\n<li> <strong>D\u00e9coupage pratique :<\/strong> Application concr\u00e8te pour dimensionner des VLANs adapt\u00e9s<\/li>\n<\/ul>\n<p> Saisir le fonctionnement des masques de sous-r\u00e9seau permet d\u2019optimiser l\u2019adressage IP et d\u2019adapter un r\u00e9seau \u00e0 ses besoins r\u00e9els.<\/p>\n<\/div><\/p>\n\n<h2 class=\"wp-block-heading\">D\u00e9chiffrer le calcul mask : base pour une gestion optimale du r\u00e9seau<\/h2>\n\n<p class=\"wp-block-paragraph\">Le calcul mask, ou calcul du masque de sous-r\u00e9seau, d\u00e9finit pr\u00e9cis\u00e9ment comment d\u00e9couper une adresse IP en deux parties : la zone identifiant le r\u00e9seau et celle d\u00e9signant les h\u00f4tes. Ce m\u00e9canisme, fondamental en IPv4, facilite la segmentation du r\u00e9seau, indispensable pour organiser et s\u00e9curiser les infrastructures.<\/p>\n\n<p class=\"wp-block-paragraph\">En entreprise, ce d\u00e9coupage permet d\u2019isoler diff\u00e9rents services via des VLANs, de limiter les collisions, et de ma\u00eetriser la consommation d\u2019adresses IP. Le masque, exprim\u00e9 en notation d\u00e9cimale (par exemple 255.255.255.0) ou CIDR (\/24), indique exactement combien de bits sont d\u00e9di\u00e9s au r\u00e9seau, les autres \u00e9tant allou\u00e9s aux h\u00f4tes. L\u2019habitude d&rsquo;utiliser la notation CIDR simplifie les calculs et l\u2019\u00e9criture des plans d\u2019adressage, essentiels pour les administrateurs.<\/p>\n\n<p class=\"wp-block-paragraph\">Les masques r\u00e9seau reposent sur le <strong>binary subnetting<\/strong> : une notion math\u00e9matique o\u00f9 les adresses d\u00e9cimales se convertissent en binaire pour appliquer des op\u00e9rations bit \u00e0 bit, notamment un ET logique, afin d\u2019extraire l\u2019adresse r\u00e9seau. Cette pr\u00e9cision technique \u00e9vite les erreurs fr\u00e9quentes rencontr\u00e9es par les d\u00e9butants lors du d\u00e9coupage, o\u00f9 une confusion entre d\u00e9cimal et binaire fausse tout le plan r\u00e9seau.<\/p>\n\n<h3 class=\"wp-block-heading\">M\u00e9thodes de masque : FLSM versus VLSM pour un adressage adapt\u00e9<\/h3>\n\n<p class=\"wp-block-paragraph\">Deux approches principales ma\u00eetrisent la planification des masques en r\u00e9seau. La premi\u00e8re, dite FLSM (Fixed Length Subnet Mask), s\u2019appuie sur des masques fixes li\u00e9s aux classes traditionnelles d\u2019adresses IP :<\/p>\n\n<ul class=\"wp-block-list\"><li><strong>Classe A<\/strong> : masque 255.0.0.0 soit \/8<\/li><li><strong>Classe B<\/strong> : masque 255.255.0.0 soit \/16<\/li><li><strong>Classe C<\/strong> : masque 255.255.255.0 soit \/24<\/li><\/ul>\n\n<p class=\"wp-block-paragraph\">Ce mode, simple, peut toutefois conduire \u00e0 un usage inefficace des adresses IP, en surestimant la taille des sous-r\u00e9seaux.<\/p>\n\n<p class=\"wp-block-paragraph\">La m\u00e9thode VLSM (Variable Length Subnet Mask), quant \u00e0 elle, propose une granularit\u00e9 adapt\u00e9e \u00e0 chaque segment du r\u00e9seau. Par exemple, dans un r\u00e9seau de classe C (\/24), on peut cr\u00e9er plusieurs sous-r\u00e9seaux de tailles distinctes selon le besoin, \u00e9vitant ainsi le gaspillage d\u2019adresses. C\u2019est la norme dans la conception r\u00e9seau moderne, notamment pour g\u00e9rer des <a href=\"https:\/\/devmath.fr\/blog\/proteger-donnees-personnelles\/\">plans d\u2019adressage<\/a> \u00e9volutifs et s\u00e9curis\u00e9s.<\/p>\n\n<figure class=\"is-provider-youtube is-type-video wp-block-embed wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Masque R\u00e9seau_PARTIE 1\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/bxh6-qV2YS0?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n<h2 class=\"wp-block-heading\">Les calculs binaires pour d\u00e9terminer adresse r\u00e9seau et plages d\u2019h\u00f4tes<\/h2>\n\n<p class=\"wp-block-paragraph\">Une adresse IPv4 se compose de quatre octets, chacun compris entre 0 et 255, cod\u00e9s sur 8 bits, soit 32 bits au total. Le masque de sous-r\u00e9seau, exprim\u00e9 \u00e9galement sur 32 bits, d\u00e9finit la limite entre la partie r\u00e9seau et la partie h\u00f4te de l\u2019adresse.<\/p>\n\n<p class=\"wp-block-paragraph\">Pour illustrer, prenons l\u2019exemple classique de l\u2019adresse <strong>192.168.1.1\/24<\/strong> :<\/p>\n\n<ul class=\"wp-block-list\"><li><strong>Adresse IP de l&rsquo;h\u00f4te :<\/strong> 192.168.1.1<\/li><li><strong>Masque du r\u00e9seau :<\/strong> \/24 (soit 255.255.255.0 en d\u00e9cimal)<\/li><\/ul>\n\n<p class=\"wp-block-paragraph\">La conversion en binaire r\u00e9v\u00e8le que les 24 premiers bits sont \u00e0 1 dans le masque, identifiant la portion r\u00e9seau, tandis que les 8 derniers bits \u00e0 0 d\u00e9finissent la zone h\u00f4te. L\u2019op\u00e9ration ET logique entre l\u2019adresse IPv4 et le masque permet alors d\u2019extraire l\u2019adresse r\u00e9seau correspondante : <strong>192.168.1.0<\/strong>.<\/p>\n\n<p class=\"wp-block-paragraph\">Le calcul du nombre d\u2019h\u00f4tes disponibles d\u00e9coule de la partie h\u00f4te : pour un masque \/24, 8 bits sont laiss\u00e9s libres, soit 2\u2078 = 256 adresses th\u00e9oriques. Deux adresses sont syst\u00e9matiquement r\u00e9serv\u00e9es : l\u2019adresse r\u00e9seau (tous bits h\u00f4te \u00e0 0) et l\u2019adresse broadcast (tous bits h\u00f4te \u00e0 1), laissant 254 adresses utilisables pour les \u00e9quipements du r\u00e9seau.<\/p>\n\n<h3 class=\"wp-block-heading\">Tableau de r\u00e9f\u00e9rence des masques CIDR et des plages d\u2019h\u00f4tes<\/h3>\n\n<figure class=\"wp-block-table\"><table>\n<thead>\n<tr>\n<th>CIDR<\/th>\n<th>Masque d\u00e9cimal<\/th>\n<th>Adresses totales<\/th>\n<th>H\u00f4tes utilisables<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\/24<\/td>\n<td>255.255.255.0<\/td>\n<td>256<\/td>\n<td>254<\/td>\n<\/tr>\n<tr>\n<td>\/25<\/td>\n<td>255.255.255.128<\/td>\n<td>128<\/td>\n<td>126<\/td>\n<\/tr>\n<tr>\n<td>\/26<\/td>\n<td>255.255.255.192<\/td>\n<td>64<\/td>\n<td>62<\/td>\n<\/tr>\n<tr>\n<td>\/27<\/td>\n<td>255.255.255.224<\/td>\n<td>32<\/td>\n<td>30<\/td>\n<\/tr>\n<tr>\n<td>\/28<\/td>\n<td>255.255.255.240<\/td>\n<td>16<\/td>\n<td>14<\/td>\n<\/tr>\n<tr>\n<td>\/29<\/td>\n<td>255.255.255.248<\/td>\n<td>8<\/td>\n<td>6<\/td>\n<\/tr>\n<tr>\n<td>\/30<\/td>\n<td>255.255.255.252<\/td>\n<td>4<\/td>\n<td>2<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">Ce tableau facilite le choix du masque appropri\u00e9 selon la taille du r\u00e9seau ou du sous-r\u00e9seau recherch\u00e9.<\/p>\n\n<figure class=\"is-provider-youtube is-type-video wp-block-embed wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"LE VLSM : Comprendre le VLSM (exercice)et faire sa comparaison avec la segmentation classique de S-R\" width=\"500\" height=\"375\" src=\"https:\/\/www.youtube.com\/embed\/q_zwv22XMbg?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n<h2 class=\"wp-block-heading\">Dimensionner un r\u00e9seau : exemple de d\u00e9coupage en VLAN<\/h2>\n\n<p class=\"wp-block-paragraph\">Reprenons un cas d\u2019entreprise disposant du r\u00e9seau <strong>10.0.0.0\/22<\/strong> et souhaitant segmenter ce r\u00e9seau en 5 VLANs, chacun avec un nombre d\u2019h\u00f4tes variables :<\/p>\n\n<ul class=\"wp-block-list\"><li>Production : 250 h\u00f4tes<\/li><li>Informatique : 120 h\u00f4tes<\/li><li>Invit\u00e9s Wi-Fi : 100 h\u00f4tes<\/li><li>Administration : 60 h\u00f4tes<\/li><li>Ressources humaines : 30 h\u00f4tes<\/li><\/ul>\n\n<p class=\"wp-block-paragraph\">Le plus grand sous-r\u00e9seau doit accueillir 252 adresses (250 + 2 pour r\u00e9seau et broadcast), donc un masque <strong>\/24<\/strong> est n\u00e9cessaire ici. Pour les autres VLANs, on ajuste les masques selon la demande :<\/p>\n\n<figure class=\"wp-block-table\"><table>\n<thead>\n<tr>\n<th>VLAN<\/th>\n<th>Plage d\u2019adresses<\/th>\n<th>Masque<\/th>\n<th>Nombre d\u2019h\u00f4tes max<\/th>\n<th>Usage<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Production<\/td>\n<td>10.0.0.0 &#8211; 10.0.0.255<\/td>\n<td>\/24<\/td>\n<td>254<\/td>\n<td>250 connect\u00e9s<\/td>\n<\/tr>\n<tr>\n<td>Informatique<\/td>\n<td>10.0.1.0 &#8211; 10.0.1.127<\/td>\n<td>\/25<\/td>\n<td>126<\/td>\n<td>120 connect\u00e9s<\/td>\n<\/tr>\n<tr>\n<td>Invit\u00e9s<\/td>\n<td>10.0.1.128 &#8211; 10.0.1.255<\/td>\n<td>\/25<\/td>\n<td>126<\/td>\n<td>100 connect\u00e9s<\/td>\n<\/tr>\n<tr>\n<td>Administration<\/td>\n<td>10.0.2.0 &#8211; 10.0.2.63<\/td>\n<td>\/26<\/td>\n<td>62<\/td>\n<td>60 connect\u00e9s<\/td>\n<\/tr>\n<tr>\n<td>Ressources humaines<\/td>\n<td>10.0.2.64 &#8211; 10.0.2.127<\/td>\n<td>\/26<\/td>\n<td>62<\/td>\n<td>30 connect\u00e9s<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">Ce d\u00e9coupage, fond\u00e9 sur un <strong>masque r\u00e9seau<\/strong> \u00e0 longueurs variables, optimise l\u2019espace d\u2019adressage tout en simplifiant la gestion des VLANs. Cette approche se pr\u00eate aussi \u00e0 la cr\u00e9ation de r\u00e8gles de filtrage pour renforcer la s\u00e9curit\u00e9.<\/p>\n\n<h3 class=\"wp-block-heading\">Astuces p\u00e9dagogiques : erreurs fr\u00e9quentes en calcul mask<\/h3>\n\n<ul class=\"wp-block-list\"><li>Confondre la notation d\u00e9cimale et la notation binaire lors de l\u2019interpr\u00e9tation du masque.<\/li><li>Oublier de soustraire les adresses r\u00e9seau et broadcast du nombre total d\u2019adresses utilisables.<\/li><li>Ne pas aligner la taille du masque sur une puissance de deux, ce qui fausse le d\u00e9coupage.<\/li><li>N\u00e9gliger l\u2019impact du masque sur la taille des VLANs et le trafic r\u00e9seau.<\/li><li>Sous-estimer l\u2019importance de planifier un adressage IP \u00e9volutif.<\/li><\/ul>\n\n<h2 class=\"wp-block-heading\">Techniques avanc\u00e9es et ressources compl\u00e9mentaires<\/h2>\n\n<p class=\"wp-block-paragraph\">Pour affiner ses comp\u00e9tences en subnetting, les outils automatis\u00e9s permettent de valider les calculs et accro\u00eetre la pr\u00e9cision. Par exemple, une <a href=\"https:\/\/devmath.fr\/blog\/powershell-download-url\/\">calculatrice de masque de sous-r\u00e9seau en ligne<\/a> simplifie la cr\u00e9ation de plans complexes et v\u00e9rifie les plages d\u2019adresses IP.<\/p>\n\n<p class=\"wp-block-paragraph\">Le <strong>binary subnetting<\/strong> est une technique que tout administrateur doit ma\u00eetriser, car elle favorise une meilleure compr\u00e9hension de la structure des r\u00e9seaux et \u00e9vite les erreurs qui peuvent co\u00fbter cher en maintenance. Par ailleurs, la gestion du r\u00e9seau s\u2019accompagne souvent d\u2019une r\u00e9flexion sur la protection des donn\u00e9es et la confidentialit\u00e9, domaines dans lesquels le choix d\u2019une architecture IP claire facilite la mise en place de r\u00e8gles et de contr\u00f4les.<\/p>\n\n<figure class=\"is-provider-youtube is-type-video wp-block-embed wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Adresse IP : d\u00e9buter avec le calcul des masques de sous-r\u00e9seaux\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/qJIXgl0EjtI?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n<script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Comment choisir entre FLSM et VLSM ?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"FLSM utilise des masques fixes, adaptu00e9s pour des ru00e9seaux homogu00e8nes, tandis que VLSM permet des masques variables, optimisant les adresses pour des besoins variu00e9s et une meilleure gestion des VLANs.\"}},{\"@type\":\"Question\",\"name\":\"Quel est lu2019impact du2019un mauvais masque de sous-ru00e9seau ?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Un masque mal calculu00e9 peut provoquer un gaspillage du2019adresses IP, des conflits du2019adressage, ou empu00eacher la communication entre u00e9quipements, affectant la stabilitu00e9 du ru00e9seau.\"}},{\"@type\":\"Question\",\"name\":\"Pourquoi soustraire deux adresses sur un ru00e9seau ?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Lu2019adresse ru00e9seau (tous bits hu00f4te u00e0 0) et lu2019adresse broadcast (tous bits u00e0 1) sont ru00e9servu00e9es respectivement pour lu2019identification globale du ru00e9seau et la diffusion.\"}},{\"@type\":\"Question\",\"name\":\"Peut-on appliquer ces mu00e9thodes en IPv6 ?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"IPv6 utilise un systu00e8me diffu00e9rent du2019adressage et de masquage, bien que le concept du2019identification de ru00e9seau et hu00f4te reste. Les masques en IPv6 sont souvent plus simples u00e0 gu00e9rer.\"}},{\"@type\":\"Question\",\"name\":\"Comment segmenter un ru00e9seau sans gaspiller du2019adresses ?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Utiliser VLSM pour adapter les tailles de sous-ru00e9seaux aux besoins ru00e9els, en calculant pru00e9cisu00e9ment le nombre du2019hu00f4tes nu00e9cessaires sur chaque segment.\"}}]}\n<\/script>\n<h3>Comment choisir entre FLSM et VLSM ?<\/h3>\n<p>FLSM utilise des masques fixes, adapt\u00e9s pour des r\u00e9seaux homog\u00e8nes, tandis que VLSM permet des masques variables, optimisant les adresses pour des besoins vari\u00e9s et une meilleure gestion des VLANs.<\/p>\n<h3>Quel est l\u2019impact d\u2019un mauvais masque de sous-r\u00e9seau ?<\/h3>\n<p>Un masque mal calcul\u00e9 peut provoquer un gaspillage d\u2019adresses IP, des conflits d\u2019adressage, ou emp\u00eacher la communication entre \u00e9quipements, affectant la stabilit\u00e9 du r\u00e9seau.<\/p>\n<h3>Pourquoi soustraire deux adresses sur un r\u00e9seau ?<\/h3>\n<p>L\u2019adresse r\u00e9seau (tous bits h\u00f4te \u00e0 0) et l\u2019adresse broadcast (tous bits \u00e0 1) sont r\u00e9serv\u00e9es respectivement pour l\u2019identification globale du r\u00e9seau et la diffusion.<\/p>\n<h3>Peut-on appliquer ces m\u00e9thodes en IPv6 ?<\/h3>\n<p>IPv6 utilise un syst\u00e8me diff\u00e9rent d\u2019adressage et de masquage, bien que le concept d\u2019identification de r\u00e9seau et h\u00f4te reste. Les masques en IPv6 sont souvent plus simples \u00e0 g\u00e9rer.<\/p>\n<h3>Comment segmenter un r\u00e9seau sans gaspiller d\u2019adresses ?<\/h3>\n<p>Utiliser VLSM pour adapter les tailles de sous-r\u00e9seaux aux besoins r\u00e9els, en calculant pr\u00e9cis\u00e9ment le nombre d\u2019h\u00f4tes n\u00e9cessaires sur chaque segment.<\/p>\n\n<p class=\"wp-block-paragraph\">Pour une compr\u00e9hension approfondie des enjeux li\u00e9s au <strong>plan d\u2019adressage<\/strong>, en lien avec la confidentialit\u00e9 et la gestion des donn\u00e9es personnelles, consultez aussi <a href=\"https:\/\/devmath.fr\/blog\/naviguer-internet-sans-pister\/\">ce guide sur la navigation priv\u00e9e et la protection en ligne<\/a>, qui compl\u00e8te bien la ma\u00eetrise technique par la vigilance informatique.<\/p>\n\n","protected":false},"excerpt":{"rendered":"<p>L&rsquo;article en bref Ma\u00eetriser le calcul mask est une \u00e9tape incontournable pour d\u00e9ployer un r\u00e9seau IP efficace et optimis\u00e9. Nous [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":316,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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