{"id":54872,"date":"2023-08-17T08:07:12","date_gmt":"2023-08-17T08:07:12","guid":{"rendered":"https:\/\/kinsta.com\/se\/?p=54872&#038;post_type=knowledgebase&#038;preview_id=54872"},"modified":"2025-10-01T20:00:36","modified_gmt":"2025-10-01T20:00:36","slug":"vad-ar-dns","status":"publish","type":"post","link":"https:\/\/kinsta.com\/se\/blog\/vad-ar-dns\/","title":{"rendered":"Vad \u00e4r DNS? En f\u00f6rklaring av Dom\u00e4nnamns-system"},"content":{"rendered":"<p>DNS, en f\u00f6rkortning av <strong>Domain Name System<\/strong>, \u00e4r en av de vanligaste men mest missf\u00f6rst\u00e5dda komponenterna i webb-landskapet. Enkelt uttryckt hj\u00e4lper DNS till att styra trafiken p\u00e5 Internet genom att koppla ihop dom\u00e4nnamn med faktiska webbservrar. I grund och botten tar den d\u00e4rf\u00f6r en m\u00e4nniskov\u00e4nlig f\u00f6rfr\u00e5gan &#8211; ett dom\u00e4nnamn som kinsta.com &#8211; och \u00f6vers\u00e4tter den till en datorv\u00e4nlig server-IP-adress &#8211; som 216.3.128.12.<\/p>\n<p>Eftersom DNS handlar om att leta upp adresser och ansluta enheter kallar m\u00e5nga DNS f\u00f6r &#8221;Internets telefonbok&#8221;. Utan DNS skulle du exempelvis beh\u00f6va memorera IP-adressen till varje webbplats f\u00f6r att komma \u00e5t den, vilket&#8230; ja, det skulle bara inte fungera!<\/p>\n<ul>\n<li><a href=\"#how-dns-works\">Hur fungerar DNS?<\/a><\/li>\n<li><a href=\"#dns-propagation\">Spridning av DNS<\/a><\/li>\n<li><a href=\"#dns-configuration\">DNS-konfiguration &#8211; S\u00e5 h\u00e4r konfigurerar du din dom\u00e4n<\/a><\/li>\n<li><a href=\"#free-dns-vs-premium-dns\">Kostnadsfritt DNS vs Premium DNS<\/a><\/li>\n<\/ul>\n<h2 id=\"how-dns-works\">Hur fungerar DNS?<\/h2>\n<p>N\u00e4r en anv\u00e4ndare skriver in en webbadress i sin webbl\u00e4sare b\u00f6rjar DNS arbeta med att koppla webbadressen till IP-adressen f\u00f6r den aktuella servern. Detta kallas DNS namn-resolution och inneb\u00e4r att en DNS-rekursor fr\u00e5gar olika namnservrar f\u00f6r att ta reda p\u00e5 den faktiska IP-adressen f\u00f6r en server.<\/p>\n<p>DNS best\u00e5r huvudsakligen av fyra komponenter:<\/p>\n<ul>\n<li><a href=\"#domain-registrar\">Dom\u00e4nregistrator<\/a><\/li>\n<li><a href=\"#nameservers\">Namnservrar<\/a><\/li>\n<li><a href=\"#dns-records\">DNS-poster<\/a><\/li>\n<li><a href=\"#web-based-services\">Webbaserade tj\u00e4nster<\/a> (exempelvis hosting-leverant\u00f6rer och e-post)<\/li>\n<\/ul>\n<p>L\u00e5t oss prata om dessa fyra komponenter och hur de fungerar tillsammans.<\/p>\n<h3 id=\"domain-registrar\">Dom\u00e4nregistrator<\/h3>\n<p>En dom\u00e4nregistrator \u00e4r den tj\u00e4nsteleverant\u00f6r d\u00e4r <a href=\"https:\/\/kinsta.com\/se\/blog\/hur-mycket-kostar-ett-domannamn\/\">dom\u00e4nnamn k\u00f6ps<\/a> och d\u00e4r dom\u00e4n-registrering uppr\u00e4tth\u00e5lls (exempelvis <a href=\"https:\/\/kinsta.com\/godaddy-alternative\/\" target=\"_blank\" rel=\"noopener noreferrer\">GoDaddy<\/a> eller Namecheap). Kinsta erbjuder inte dom\u00e4nregistrering men h\u00e4r \u00e4r v\u00e5r <a href=\"https:\/\/kinsta.com\/se\/blog\/basta-domanregistratorn\/\" target=\"_blank\" rel=\"noopener noreferrer\">lista \u00f6ver de b\u00e4sta dom\u00e4n-registratorerna<\/a>.<\/p>\n<p><strong>Registratorn \u00e4r platsen d\u00e4r dom\u00e4nnamns-servrarna \u00e4r specificerade.<\/strong><\/p>\n<p>De flesta registratorer inkluderar grundl\u00e4ggande DNS-tj\u00e4nst med kostnaden f\u00f6r dom\u00e4n-registrering. Om du inte l\u00e4gger till egna namnservrar till dom\u00e4nen kommer dom\u00e4nen d\u00e4rf\u00f6r att anv\u00e4nda registratorns standard-namnservrar. Som ett resultat hanteras DNS-poster i de allra flesta fall av registratorn som standard.<\/p>\n<h3 id=\"nameservers\">Namnservrar<\/h3>\n<p><a href=\"https:\/\/kinsta.com\/se\/blog\/vad-ar-en-namnserver\/\">Namn-servrar<\/a> \u00e4r ungef\u00e4r som webb-servrar. De \u00e4r dock konfigurerade f\u00f6r att <strong>lagra DNS-poster<\/strong> i st\u00e4llet f\u00f6r att servera webbplatser eller webb-applikationer.<\/p>\n<p>N\u00e4r du vill \u00e4ndra en DNS-post m\u00e5ste du d\u00e4rf\u00f6r \u00e4ndra DNS-posterna p\u00e5 de namnservrar som har angetts av registratorn eller en tredjeparts-tj\u00e4nst som Cloudflare.<\/p>\n<p>Det h\u00e4r steget \u00e4r ofta lite f\u00f6rvirrande, s\u00e5 l\u00e5t oss f\u00f6rklara det lite n\u00e4rmare genom att titta p\u00e5 ett fiktivt exempel:<\/p>\n<ol>\n<li>Din dom\u00e4n (example.com) \u00e4r registrerad hos GoDaddy.<\/li>\n<li>Du l\u00e4gger till Cloudflare&#8217;s namnservrar till example.com i ditt GoDaddy-konto f\u00f6r att b\u00f6rja anv\u00e4nda Cloudflare.<\/li>\n<li>D\u00e4refter \u00e4ndrar du en DNS-post f\u00f6r example.com p\u00e5 GoDaddy. Den h\u00e4r \u00e4ndringen kommer inte att g\u00f6ra n\u00e5got eftersom dom\u00e4nen inte anv\u00e4nder GoDaddy&#8217;s namnservrar.<\/li>\n<li>Efter detta g\u00f6r du samma DNS-\u00e4ndring f\u00f6r example.com p\u00e5 Cloudflare. \u00c4ndringen kommer att vara effektiv eftersom dom\u00e4nen anv\u00e4nder Cloudflare&#8217;s namnservrar.<\/li>\n<\/ol>\n<p>Om du bara anv\u00e4nder GoDaddy m\u00e5ste du d\u00e4rf\u00f6r uppdatera dina DNS-poster med GoDaddy eftersom de kontrollerar dina namnservrar. Ifall du anv\u00e4nder Cloudflare m\u00e5ste du uppdatera dina DNS-poster med Cloudflare eftersom de kontrollerar dina namnservrar. Detsamma g\u00e4ller f\u00f6r dem som anv\u00e4nder Kinsta&#8217;s DNS.<\/p>\n<p>Du kan inte bes\u00f6ka en webbplats utan att f\u00f6rst komma \u00e5t en dom\u00e4nnamns-server. Under processen kan du m\u00f6tas av ett meddelande som &#8221;<a href=\"https:\/\/kinsta.com\/blog\/dns-server-not-responding\/\">DNS-servern svarar inte<\/a>&#8221;, vilket i princip inneb\u00e4r att det decentraliserade namnsystemet som ansvarar f\u00f6r att f\u00f6rvandla host-namn till IP-adresser inte svarade.<\/p>\n<h3 id=\"dns-records\">DNS-poster<\/h3>\n<p><strong>DNS-poster associerar en dom\u00e4n med en webbaserad tj\u00e4nst.<\/strong><\/p>\n<p>Det finns flera olika typer av DNS-poster, men i de flesta fall anv\u00e4nds endast 4 eller 5 typer:<\/p>\n<ul>\n<li><strong>A-poster<\/strong>: Dessa poster anv\u00e4nds f\u00f6r att rikta en dom\u00e4n eller en underdom\u00e4n mot en <a href=\"https:\/\/kinsta.com\/docs\/wordpress-hosting\/site-management\/ip-addresses\/#site-ip-address-ipv4\" target=\"_blank\" rel=\"noopener noreferrer\">IPv4-adress<\/a>. Det h\u00e4r \u00e4r den regel som anv\u00e4nds f\u00f6r att rikta en dom\u00e4n som example.com till den webbserver d\u00e4r webbplatsen example.com finns. (Observera: Om en webbserver anv\u00e4nder en IPv6-adress i st\u00e4llet f\u00f6r en IPv4-adress anv\u00e4nds en AAAA-post i st\u00e4llet f\u00f6r en A-post).<\/li>\n<li><strong>CNAME-poster<\/strong>: Anv\u00e4nds f\u00f6r att associera en underdom\u00e4n till den prim\u00e4ra eller kanoniska dom\u00e4nen. Denna typ av regel anv\u00e4nds exempelvis f\u00f6r att associera en www-subdom\u00e4n med den prim\u00e4ra dom\u00e4nen, som www.example.com med example.com.<\/li>\n<li><strong>MX-poster<\/strong>: Dessa nyttjas f\u00f6r att associera en dom\u00e4n med en e-posttj\u00e4nst. Den h\u00e4r typen av regel anv\u00e4nds om du vill att e-post till example.com ska levereras till en specifik e-posttj\u00e4nst, exempelvis Gmail.<\/li>\n<li><strong>TXT-poster<\/strong>: Anv\u00e4nds f\u00f6r att associera godtycklig text till en dom\u00e4n. Vanligtvis anv\u00e4nds TXT-poster f\u00f6r att associera SPF-poster med en dom\u00e4n f\u00f6r att f\u00f6rb\u00e4ttra e-postleveransen. De skapar dessutom ett skydd mot spammare som missbrukar dom\u00e4nnamnet n\u00e4r de skickar ut skr\u00e4ppost. L\u00e4s v\u00e5rt djupg\u00e5ende blogginl\u00e4gg om <a href=\"https:\/\/kinsta.com\/se\/blog\/e-postautentisering\/\" target=\"_blank\" rel=\"noopener noreferrer\">e-postautentisering<\/a> och varf\u00f6r det \u00e4r viktigt.<\/li>\n<\/ul>\n<figure style=\"width: 904px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2022\/10\/mykinsta-dns-add-a-record.png\" alt=\"L\u00e4gga till en A-post i Kinsta's DNS.\" width=\"904\" height=\"462\"><figcaption class=\"wp-caption-text\">L\u00e4gga till en A-post i Kinsta&#8217;s DNS.<\/figcaption><\/figure>\n<h3 id=\"web-based-services\">Webbtj\u00e4nster<\/h3>\n<p>I v\u00e5rt fall \u00e4r webbtj\u00e4nsten hosting-leverant\u00f6r. En A-post (eller AAAA-post) m\u00e5ste l\u00e4ggas till i en dom\u00e4ns namnservrar f\u00f6r att associera den dom\u00e4nen med de webbservrar som hostar webbplatsen.<\/p>\n<p>Det finns m\u00e5nga andra typer av webbtj\u00e4nster som associeras med en dom\u00e4n via DNS-poster: e-post, SFTP, kontrollpaneler f\u00f6r hosting-tj\u00e4nster, webbmail-program och phpMyAdmin, f\u00f6r att bara n\u00e4mna n\u00e5gra.<\/p>\n<h2 id=\"dns-propagation\">DNS-spridning<\/h2>\n<p>N\u00e4r du g\u00f6r en \u00e4ndring i DNS f\u00f6r en viss dom\u00e4n &#8211; exempelvis uppdaterar en DNS-post eller byter namnservrar &#8211; tar det lite tid innan \u00e4ndringarna tr\u00e4der i kraft. <a href=\"https:\/\/kinsta.com\/blog\/dns-propagation\/\" target=\"_blank\" rel=\"noopener noreferrer\">Denna tid kallas f\u00f6r spridning<\/a>.<\/p>\n<p>Spridningen varierar avsev\u00e4rt fr\u00e5n en situation till en annan.<\/p>\n<p>N\u00e4r det g\u00e4ller DNS-poster har varje post ett associerat<strong> <a href=\"https:\/\/kinsta.com\/blog\/what-is-ttl\/\">TTL-v\u00e4rde<\/a> (Time to Live)<\/strong>. Det h\u00e4r v\u00e4rdet avg\u00f6r hur snabbt \u00e4ndringar av DNS-poster tr\u00e4der i kraft.<\/p>\n<p>I de flesta fall \u00e4r TTL f\u00f6r DNS-poster inst\u00e4llt p\u00e5 1 eller 4 timmar som standard. Som ett resultat tar det f\u00f6r det mesta upp till 4 timmar innan DNS-\u00e4ndringar b\u00f6rjar g\u00e4lla. Det \u00e4r dessutom m\u00f6jligt med h\u00f6gre TTL-v\u00e4rden och de g\u00f6r att det tar l\u00e4ngre tid innan \u00e4ndringarna f\u00e5r full effekt, n\u00e4r en DNS-post uppdateras. I vissa extrema fall kan TTL-v\u00e4rden vara s\u00e5 h\u00f6ga som en vecka.<\/p>\n<p>N\u00e4r det g\u00e4ller namnservrar best\u00e4mmer registratorn TTL-v\u00e4rdet och det kan i allm\u00e4nhet inte \u00e4ndras. N\u00e4r du byter till nya namnservrar kan det d\u00e4rf\u00f6r ta fr\u00e5n n\u00e5gra minuter upp till en dag eller l\u00e4ngre f\u00f6r dessa \u00e4ndringar att tr\u00e4da i kraft.<\/p>\n<p>Hosting-leverant\u00f6ren (Kinsta) kan inte p\u00e5skynda <a href=\"https:\/\/kinsta.com\/blog\/dns-propagation\/\" target=\"_blank\" rel=\"noopener noreferrer\">DNS-spridning<\/a>. Vad du kan g\u00f6ra \u00e4r att minska TTL i god tid innan du g\u00f6r n\u00e5gra \u00e4ndringar i DNS-poster s\u00e5 att \u00e4ndringarna sprids s\u00e5 snabbt som m\u00f6jligt. Du kan exempelvis anv\u00e4nda ett onlineverktyg som <a href=\"https:\/\/www.whatsmydns.net\/\" target=\"_blank\" rel=\"noopener noreferrer\">whatsmydns.net<\/a> f\u00f6r att testa om dina DNS-\u00e4ndringar har slutf\u00f6rts.<\/p>\n<h2 id=\"dns-configuration\">DNS-konfiguration &#8211; S\u00e5 h\u00e4r konfigurerar du din dom\u00e4n<\/h2>\n<p>Det finns tv\u00e5 vanliga s\u00e4tt att st\u00e4lla in ditt DNS. Kinsta st\u00f6der b\u00e5da metoderna, och du kan v\u00e4lja vilken metod som du f\u00f6redrar.<\/p>\n<p>En metod \u00e4r att helt enkelt rikta din dom\u00e4ns namnservrar till din hosts namnservrar via din dom\u00e4nnamns-registrator. Dessa \u00e4r ett minimum av tv\u00e5 separata dom\u00e4ner som ser ut ungef\u00e4r s\u00e5 h\u00e4r (du kan ha fler \u00e4n tv\u00e5 namnservrar, bara inte f\u00e4rre):<\/p>\n<ul>\n<li>ns1.dinhost.com<\/li>\n<li>ns2.dinhost.com<\/li>\n<\/ul>\n<p>P\u00e5 Kinsta samarbetade vi med Amazon Route 53 f\u00f6r att erbjuda premium-namnservrar till v\u00e5ra kunder utan extra kostnad. Dessa \u00e4r fyra separata namnservrar som ser ut ungef\u00e4r s\u00e5 h\u00e4r:<\/p>\n<ul>\n<li>ns-xxx.awsdns-60.net<\/li>\n<li>ns-xxxx.awsdns-27.org<\/li>\n<\/ul>\n<figure style=\"width: 1193px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/wp-content\/uploads\/2022\/10\/mykinsta-dns-successful-domain.png\" alt=\"Kinsta's Amazon Route 53-namnservrar i MyKinsta.\" width=\"1193\" height=\"525\"><figcaption class=\"wp-caption-text\">Kinsta&#8217;s Amazon Route 53-namnservrar i MyKinsta.<\/figcaption><\/figure>\n<p>Oavsett om du anv\u00e4nder Kinsta&#8217;s kostnadsfria premium-DNS eller en tredje parts, m\u00e5ste du konfigurera de poster som riktas mot din prim\u00e4ra dom\u00e4n och eventuella ytterligare dom\u00e4ner p\u00e5 din webbplats.<\/p>\n<p>Om din webbplats \u00e4r hostad hos oss b\u00f6r du l\u00e4sa v\u00e5r guide f\u00f6r att <a href=\"https:\/\/kinsta.com\/docs\/wordpress-hosting\/wordpress-domains\/\" target=\"_blank\" rel=\"noopener noreferrer\">l\u00e4gga till en dom\u00e4n till en webbplats p\u00e5 Kinsta<\/a>, som dessutom t\u00e4cker olika permutationer av v\u00e5r plattforms integrering med Cloudflare.<\/p>\n<p>F\u00f6r mer detaljerad information om uppdatering av DNS hos n\u00e5gra popul\u00e4ra registratorer och DNS-hanterare, kolla in dessa artiklar:<\/p>\n<ul>\n<li><a href=\"https:\/\/kinsta.com\/se\/blog\/godaddy-a-record\/\">S\u00e5 h\u00e4r l\u00e4gger du till en A-post med GoDaddy<\/a><\/li>\n<li><a href=\"https:\/\/kinsta.com\/blog\/bluehost-a-record-cname\/\">L\u00e4gg till en A-post och CNAME hos Bluehost<\/a><\/li>\n<li><a href=\"https:\/\/kinsta.com\/blog\/namecheap-add-a-record\/\">Hur man l\u00e4gger till en A-post med Namecheap<\/a><\/li>\n<\/ul>\n<h2 id=\"free-dns-vs-premium-dns\">Kostnadsfritt DNS vs Premium DNS<\/h2>\n<p>Du kan hitta b\u00e5de kostnadsfria DNS och premium-DNS. Alla Kinsta-kunder f\u00e5r tillg\u00e5ng till premium-DNS via Amazon Route 53. Vi tror generellt att premium-DNS <a href=\"https:\/\/kinsta.com\/blog\/premium-dns\/\" target=\"_blank\" rel=\"noopener noreferrer\">\u00e4r en n\u00f6dv\u00e4ndighet<\/a> i dagens v\u00e4rld.<\/p>\n<p>En stor anledning till att v\u00e4lja premium DNS \u00e4r <strong>hastighet<\/strong> <strong>och tillf\u00f6rlitlighet<\/strong>. Att leta upp DNS-poster och dirigera trafik tar tid, \u00e4ven om det bara handlar om millisekunder.<\/p>\n<p>Den kostnadsfria DNS som du f\u00e5r fr\u00e5n din dom\u00e4nnamns-registrator \u00e4r vanligtvis j\u00e4mf\u00f6relsevis l\u00e5ngsamt, medan premium-DNS ofta erbjuder en b\u00e4ttre prestanda.<\/p>\n<p>Premium-DNS kan dessutom erbjuda b\u00e4ttre s\u00e4kerhet och tillg\u00e4nglighet, s\u00e4rskilt n\u00e4r du uts\u00e4tts f\u00f6r en <a href=\"https:\/\/kinsta.com\/se\/blog\/vad-ar-en-ddos-attack\/\">DDoS-attack<\/a>.<\/p>\n<p>Cloudflare DNS \u00e4r ett bra mellanting mellan ett kostnadsfritt DNS fr\u00e5n din dom\u00e4nregistrator och premium-DNS. Det \u00e4r dessutom en kostnadsfri tj\u00e4nst som fortfarande erbjuder m\u00e5nga av f\u00f6rdelarna med premium-DNS. T\u00e4nk bara p\u00e5 att om du <a href=\"https:\/\/kinsta.com\/se\/blog\/installerar-cloudflare\/\" target=\"_blank\" rel=\"noopener noreferrer\">anv\u00e4nder Cloudflare DNS<\/a> kommer du inte att kunna anv\u00e4nda det inkluderade premium-DNS: et fr\u00e5n Amazon Route 53.<\/p>\n<h2>Sammanfattning<\/h2>\n<p>Nu f\u00f6rst\u00e5r du f\u00f6rhoppningsvis lite mer om hur DNS fungerar. Sammanfattningsvis anv\u00e4nds DNS f\u00f6r att associera webbaserade tj\u00e4nster, exempelvis hosting-leverant\u00f6rer och e-post, med ett dom\u00e4nnamn. Detta inneb\u00e4r fyra steg:<\/p>\n<ol>\n<li>Dom\u00e4nen m\u00e5ste registreras hos en dom\u00e4nregistrator.<\/li>\n<li>Namnservrarna m\u00e5ste d\u00e4refter anges av dom\u00e4nregistratorn.<\/li>\n<li>DNS-poster m\u00e5ste l\u00e4ggas till p\u00e5 de namnservrar som anges av dom\u00e4nregistratorn eller en tredjepartstj\u00e4nst som Cloudflare.<\/li>\n<li>DNS-posterna m\u00e5ste dessutom vara fullst\u00e4ndigt spridda f\u00f6r att dom\u00e4nen ska kunna associeras med varje relevant webbtj\u00e4nst.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>DNS, en f\u00f6rkortning av Domain Name System, \u00e4r en av de vanligaste men mest missf\u00f6rst\u00e5dda komponenterna i webb-landskapet. Enkelt uttryckt hj\u00e4lper DNS till att styra trafiken &#8230;<\/p>\n","protected":false},"author":38,"featured_media":54873,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kinsta_gated_content":false,"_kinsta_gated_content_redirect":"","footnotes":""},"tags":[248,30],"topic":[770],"class_list":["post-54872","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","tag-dns","tag-webhosting","topic-domannamnssystem"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.6 (Yoast SEO v24.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Vad \u00e4r DNS? En f\u00f6rklaring av dom\u00e4nnamn-system<\/title>\n<meta name=\"description\" content=\"DNS, Domain Name System, dirigerar trafiken p\u00e5 internet genom att ansluta dom\u00e4nnamn med faktiska webbservrar. 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