{"id":4165,"date":"2026-01-09T15:30:28","date_gmt":"2026-01-09T13:30:28","guid":{"rendered":"https:\/\/www.nav.ro\/blog\/?p=4165"},"modified":"2026-01-09T15:30:28","modified_gmt":"2026-01-09T13:30:28","slug":"ce-este-un-as-number-autonomous-system-number-si-de-ce-este-important-pe-internet","status":"publish","type":"post","link":"https:\/\/www.nav.ro\/blog\/ce-este-un-as-number-autonomous-system-number-si-de-ce-este-important-pe-internet\/","title":{"rendered":"Ce este un AS Number (Autonomous System Number) \u0219i de ce este important pe internet"},"content":{"rendered":"\n<p>Internetul pare simplu la suprafa\u021b\u0103: introduci o adres\u0103 \u0219i site-ul se \u00eencarc\u0103. \u00cen spate \u00eens\u0103, lucrurile sunt mult mai complexe. Una dintre piesele-cheie care fac posibil\u0103 comunicarea dintre re\u021bele este <strong>AS Number-ul (Autonomous System Number)<\/strong>. \u00cen acest articol \u00ee\u021bi explic clar ce este un AS Number, cum func\u021bioneaz\u0103 \u0219i de ce este esen\u021bial pentru infrastructura internetului.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Ce este un AS Number?<\/h2>\n\n\n\n<p>Un <strong>AS Number (ASN)<\/strong> este un identificator unic atribuit unui <strong>Sistem Autonom (Autonomous System \u2013 AS)<\/strong>. Un sistem autonom reprezint\u0103 o re\u021bea sau un grup de re\u021bele IP administrate de o singur\u0103 organiza\u021bie (de exemplu un ISP, un data center, un furnizor de cloud sau o companie mare) care aplic\u0103 o politic\u0103 unitar\u0103 de rutare.<\/p>\n\n\n\n<p>Pe scurt:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>AS = re\u021bea mare administrat\u0103 centralizat<\/strong><\/li>\n\n\n\n<li><strong>ASN = num\u0103rul unic care identific\u0103 acea re\u021bea pe internet<\/strong><\/li>\n<\/ul>\n\n\n\n<p>Exemple de organiza\u021bii care de\u021bin ASN-uri:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>furnizori de internet (ISP-uri)<\/li>\n\n\n\n<li>companii de hosting \u0219i data center<\/li>\n\n\n\n<li>gigan\u021bi tech (Google, Amazon, Microsoft)<\/li>\n\n\n\n<li>institu\u021bii mari sau re\u021bele educa\u021bionale<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">De ce este nevoie de AS Number?<\/h2>\n\n\n\n<p>Internetul este format din mii de re\u021bele independente care trebuie s\u0103 \u201e\u0219tie\u201d unele de altele pentru a putea face schimb de trafic. AS Number-ele permit:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>identificarea clar\u0103 a fiec\u0103rei re\u021bele<\/li>\n\n\n\n<li>schimbul de informa\u021bii de rutare \u00eentre re\u021bele<\/li>\n\n\n\n<li>stabilirea politicilor de trafic (pe unde trece traficul \u0219i pe unde nu)<\/li>\n<\/ul>\n\n\n\n<p>F\u0103r\u0103 ASN-uri, internetul nu ar putea func\u021biona la scar\u0103 global\u0103.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Leg\u0103tura dintre AS Number \u0219i BGP<\/h2>\n\n\n\n<p>AS Number-ele sunt folosite \u00een protocolul <strong>BGP (Border Gateway Protocol)<\/strong> \u2013 protocolul care se ocup\u0103 de rutarea traficului \u00eentre sisteme autonome.<\/p>\n\n\n\n<p>BGP:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>nu caut\u0103 cel mai scurt drum, ci <strong>cel mai bun drum<\/strong><\/li>\n\n\n\n<li>\u021bine cont de politici de rutare, costuri \u0219i preferin\u021be<\/li>\n\n\n\n<li>folose\u0219te ASN-uri pentru a evita buclele de rutare<\/li>\n<\/ul>\n\n\n\n<p>Atunci c\u00e2nd un AS anun\u021b\u0103 un prefix IP, acesta este \u00eenso\u021bit de ASN-ul s\u0103u, astfel \u00eenc\u00e2t celelalte re\u021bele s\u0103 \u0219tie de unde provine ruta.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Tipuri de AS Number<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. ASN public<\/h3>\n\n\n\n<p>Un <strong>ASN public<\/strong> este unic la nivel global \u0219i este folosit pentru rutarea pe internetul public. Este necesar dac\u0103:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ai propriile blocuri IP publice<\/li>\n\n\n\n<li>faci peering cu al\u021bi operatori<\/li>\n\n\n\n<li>rulezi BGP cu mai mul\u021bi furnizori de upstream<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. ASN privat<\/h3>\n\n\n\n<p>ASN-urile private sunt folosite doar intern \u0219i nu sunt rutabile pe internetul public.<\/p>\n\n\n\n<p>Intervale ASN private:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>64512 \u2013 65534<\/strong> (ASN pe 16 bi\u021bi)<\/li>\n\n\n\n<li><strong>4200000000 \u2013 4294967294<\/strong> (ASN pe 32 bi\u021bi)<\/li>\n<\/ul>\n\n\n\n<p>Sunt utile \u00een re\u021bele interne, laboratoare sau infrastructuri izolate.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">ASN pe 16 bi\u021bi vs ASN pe 32 bi\u021bi<\/h2>\n\n\n\n<p>Ini\u021bial, ASN-urile au fost pe <strong>16 bi\u021bi<\/strong>, ceea ce limita num\u0103rul total la aproximativ 65.000. Pe m\u0103sur\u0103 ce internetul a crescut, acest spa\u021biu s-a epuizat.<\/p>\n\n\n\n<p>Ast\u0103zi se folosesc:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>ASN pe 16 bi\u021bi<\/strong> \u2013 format vechi<\/li>\n\n\n\n<li><strong>ASN pe 32 bi\u021bi<\/strong> \u2013 format modern, mult mai larg<\/li>\n<\/ul>\n\n\n\n<p>Majoritatea re\u021belelor actuale folosesc ASN-uri pe 32 bi\u021bi.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Cine atribuie AS Number-ele?<\/h2>\n\n\n\n<p>ASN-urile sunt alocate de organiza\u021bii numite <strong>RIR (Regional Internet Registries)<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>RIPE NCC<\/strong> \u2013 Europa<\/li>\n\n\n\n<li><strong>ARIN<\/strong> \u2013 America de Nord<\/li>\n\n\n\n<li><strong>APNIC<\/strong> \u2013 Asia-Pacific<\/li>\n\n\n\n<li><strong>LACNIC<\/strong> \u2013 America Latin\u0103<\/li>\n\n\n\n<li><strong>AFRINIC<\/strong> \u2013 Africa<\/li>\n<\/ul>\n\n\n\n<p>\u00cen Rom\u00e2nia \u0219i Europa, ASN-urile sunt gestionate de <strong>RIPE NCC<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Exemple de AS Number cunoscute<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>AS15169<\/strong> \u2013 Google<\/li>\n\n\n\n<li><strong>AS16509<\/strong> \u2013 Amazon (AWS)<\/li>\n\n\n\n<li><strong>AS8075<\/strong> \u2013 Microsoft<\/li>\n\n\n\n<li><strong>AS13335<\/strong> \u2013 Cloudflare<\/li>\n<\/ul>\n\n\n\n<p>Po\u021bi verifica ASN-ul unui site folosind diverse unelte de tip WHOIS sau BGP lookup.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">C\u00e2nd ai nevoie de un AS Number?<\/h2>\n\n\n\n<p>Ai nevoie de un ASN dac\u0103:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>de\u021bii propriile adrese IP publice<\/li>\n\n\n\n<li>vrei redundan\u021b\u0103 prin mai mul\u021bi furnizori de internet<\/li>\n\n\n\n<li>rulezi BGP \u00eentr-un data center<\/li>\n\n\n\n<li>e\u0219ti ISP sau furnizor de servicii de re\u021bea<\/li>\n<\/ul>\n\n\n\n<p>Pentru un site obi\u0219nuit sau un server simplu, <strong>nu este necesar<\/strong> un ASN propriu.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">AS Number \u0219i securitatea internetului<\/h2>\n\n\n\n<p>ASN-urile joac\u0103 un rol important \u0219i \u00een securitate:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ajut\u0103 la identificarea sursei atacurilor de re\u021bea<\/li>\n\n\n\n<li>sunt folosite \u00een filtrarea traficului mali\u021bios<\/li>\n\n\n\n<li>stau la baza mecanismelor de securitate precum <strong>RPKI<\/strong><\/li>\n<\/ul>\n\n\n\n<p>Un ASN bine configurat contribuie la stabilitatea \u0219i siguran\u021ba internetului.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Concluzie<\/h2>\n\n\n\n<p>AS Number-ul este un element fundamental al infrastructurii internetului. De\u0219i utilizatorul obi\u0219nuit nu \u00eel vede, f\u0103r\u0103 ASN-uri \u0219i BGP, internetul a\u0219a cum \u00eel \u0219tim nu ar exista.<\/p>\n\n\n\n<p>Dac\u0103 activezi \u00een domeniul hostingului, networkingului sau al infrastructurii IT, \u00een\u021belegerea AS Number-elor este esen\u021bial\u0103 pentru a lucra corect \u0219i profesionist cu re\u021belele moderne.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Internetul pare simplu la suprafa\u021b\u0103: introduci o adres\u0103 \u0219i site-ul se \u00eencarc\u0103. \u00cen spate \u00eens\u0103, lucrurile sunt mult mai complexe. Una dintre piesele-cheie care fac posibil\u0103 comunicarea dintre re\u021bele este AS Number-ul (Autonomous System Number). \u00cen acest articol \u00ee\u021bi explic clar ce este un AS Number, cum func\u021bioneaz\u0103 \u0219i de ce este esen\u021bial pentru infrastructura<\/p>\n","protected":false},"author":1,"featured_media":4167,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[155],"tags":[587,479,130,179],"class_list":["post-4165","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-info","tag-as-number","tag-bgp","tag-network","tag-networking"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ce este un AS Number (Autonomous System Number) \u0219i de ce este important pe internet - NAV.RO Blog<\/title>\n<meta name=\"description\" content=\"Una dintre piesele-cheie care fac posibil\u0103 comunicarea dintre re\u021bele este AS Number-ul (Autonomous System Number).\" \/>\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.nav.ro\/blog\/ce-este-un-as-number-autonomous-system-number-si-de-ce-este-important-pe-internet\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ce este un AS Number (Autonomous System Number) \u0219i de ce este important pe internet - 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