{"id":330,"date":"2021-02-26T15:32:55","date_gmt":"2021-02-26T14:32:55","guid":{"rendered":"https:\/\/dev.sourcecode.sk\/wsczkb\/?post_type=ht_kb&#038;p=330"},"modified":"2023-06-22T15:05:15","modified_gmt":"2023-06-22T13:05:15","slug":"co-je-to-dns","status":"publish","type":"ht_kb","link":"https:\/\/www.websupport.cz\/podpora\/kb\/co-je-to-dns\/","title":{"rendered":"Co je to DNS"},"content":{"rendered":"\n<p style=\"font-size:18px\">Syst\u00e9m <strong>DNS z\u00e1znam\u016f<\/strong> slou\u017e\u00ed na internetu a na po\u010d\u00edta\u010dov\u00fdch s\u00edt\u00edch na p\u0159ekl\u00e1d\u00e1n\u00ed dom\u00e9nov\u00fdch n\u00e1zv\u016f na <strong>IP adresy<\/strong> a zabezpe\u010duje tak <strong>zjednodu\u0161en\u00ed komunikace<\/strong> a pohybu na internetu. &nbsp;\u010casto je p\u0159irovn\u00e1van\u00fd k telefonn\u00edmu seznamu, p\u0159i\u0159azuje toti\u017e IP adres\u00e1m slovn\u00ed (dom\u00e9nov\u00fd) n\u00e1zev.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>U\u017eivatel si <strong>d\u00edky&nbsp;DNS<\/strong> <strong>nemus\u00ed pamatovat IP adresu<\/strong> str\u00e1nky, ale pouze n\u00e1zev dom\u00e9ny. Syst\u00e9m DNS se o navigaci postar\u00e1 za u\u017eivatele. Internetov\u00fd prohl\u00ed\u017ee\u010d p\u0159i zadan\u00ed adresy str\u00e1nky zjist\u00ed, na kter\u00e9m DNS serveru se nach\u00e1zej\u00ed z\u00e1znamy pro konkr\u00e9tn\u00ed dom\u00e9nu a na DNS serveru zji\u0161\u0165uje IP adresy, kter\u00e9 jsou pro dom\u00e9nu nastaven\u00e9. DNS z\u00e1znam dom\u00e9ny obsahuje v\u00edcero typ\u016f z\u00e1znam\u016f, z nich\u017e ka\u017ed\u00fd m\u00e1 jinou funkci.&nbsp;Nejpou\u017e\u00edvan\u011bj\u0161\u00ed jsou n\u00e1sledovn\u00e9 typy z\u00e1znam\u016f:<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Jak\u00e9 typy DNS z\u00e1znam\u016f existuj\u00ed?<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">A z\u00e1znamy<\/h3>\n\n\n\n<p>DNS z\u00e1znam typu A slou\u017e\u00ed pro nastaven\u00ed konkr\u00e9tn\u00ed IP adresy, z kter\u00e9 se m\u00e1 na\u010d\u00edtat obsah pro danou adresu (dom\u00e9nu nebo subdom\u00e9nu). Pro ka\u017edou subdom\u00e9nu je mo\u017en\u00e9 nastavit libovolnou IP adresu podle pot\u0159eby. IP adresu je nutn\u00e9 zadat ve form\u00e1tu IPv4 (nap\u0159. 37.9.168.19). Pro IP adresu ve tvaru IPv6 pou\u017eijte AAAA z\u00e1znam.<\/p>\n\n\n\n<p><strong>Jak vypad\u00e1 DNS A z\u00e1znam<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">*  600  IN  A   37.9.175.13<\/pre>\n\n\n\n<p class=\"wp-block-ht-blocks-messages wp-block-hb-message wp-block-hb-message--withicon is-style-info\"><strong>P\u0159\u00edklad nastaven\u00ed A z\u00e1znam\u016f<\/strong><br>Dom\u00e9na&nbsp;<em>mojedomena.cz<\/em>&nbsp;m\u00e1 pomoc\u00ed A z\u00e1znamu p\u0159i\u0159azenou IP adresu&nbsp;<em>37.9.168.19<\/em>. To znamen\u00e1, \u017ee po zadan\u00ed adresy mojedomena.cz se v prohl\u00ed\u017ee\u010di zobraz\u00ed obsah ze serveru se zadanou IP<\/p>\n\n\n\n<p><strong><a href=\"https:\/\/www.websupport.cz\/podpora\/kb\/a-zaznamy\/\" target=\"_blank\" rel=\"noreferrer noopener\">N\u00e1vod pro nastaven\u00ed A z\u00e1znam\u016f<\/a><\/strong><\/p>\n\n\n\n<div style=\"height:47px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">MX z\u00e1znamy<\/h3>\n\n\n\n<p><strong>MX&nbsp;z\u00e1znam<\/strong>&nbsp;(<em>mail exchanger<\/em>) slou\u017e\u00ed pro ur\u010den\u00ed serveru, kter\u00fd m\u00e1 zpracov\u00e1vat e-maily pro Va\u0161i dom\u00e9nu. MX z\u00e1znam\u016f pro jednu dom\u00e9nu m\u016f\u017eete zadat hned n\u011bkolik a e-maily budou sm\u011b\u0159ovan\u00e9 podle priority t\u011bchto z\u00e1znam\u016f. Hodnota MX z\u00e1znamu se zad\u00e1v\u00e1 v textov\u00e9 podob\u011b (mailin1.mojedomena.cz), ne jako IP adresa.<\/p>\n\n\n\n<p><strong>Jak vypad\u00e1 DNS MX z\u00e1znam<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">@  600  IN  MX   10    mailin1.vasedomena.tld.\n@  600  IN  MX   100    mailin2.vasedomena.tld.<\/pre>\n\n\n\n<p class=\"wp-block-ht-blocks-messages wp-block-hb-message wp-block-hb-message--withicon is-style-info\"><strong>P\u0159\u00edklad nastaven\u00ed MX z\u00e1znam\u016f<\/strong><br>Pro dom\u00e9nu mojedomena.cz m\u00e1te vytvo\u0159en\u00fd MX z\u00e1znam s hodnotou \u201cASPMX.L.GOOGLE.COM\u201d . V tom p\u0159\u00edpad\u011b budou v\u0161echny e-maily zaslan\u00e9 na neco@mojedomena.cz sm\u011b\u0159ovan\u00e9 na po\u0161tovn\u00ed server spole\u010dnosti Google.<\/p>\n\n\n\n<p><strong><a href=\"https:\/\/www.websupport.cz\/podpora\/kb\/mx-zaznamy\/\" target=\"_blank\" rel=\"noreferrer noopener\">N\u00e1vod pro nastaven\u00ed MX z\u00e1znam\u016f<\/a><\/strong><\/p>\n\n\n\n<div style=\"height:52px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">NS z\u00e1znamy<\/h3>\n\n\n\n<p>NS z\u00e1znamy, naz\u00fdvan\u00e9 tak\u00e9 nameservery, umo\u017e\u0148uj\u00ed ur\u010dit adresu, kde jsou um\u00edst\u011bn\u00e9 DNS z\u00e1znamy Va\u0161\u00ed dom\u00e9ny. Zm\u011bna se vykon\u00e1v\u00e1 u n\u00e1rodn\u00edho registr\u00e1tora dan\u00e9 dom\u00e9ny, kter\u00fd d\u00edky tomu v\u00ed, kam nasm\u011brovat v\u0161echny p\u0159\u00edchoz\u00ed popt\u00e1vky na danou adresu. Jsou jim pod\u0159azen\u00e9 v\u0161echny ostatn\u00ed DNS z\u00e1znamy.<\/p>\n\n\n\n<p><strong>Jak vypadaj\u00ed NS z\u00e1znamy<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">@  86400  IN  NS   ns1.websupport.cz.\n@  86400  IN  NS   ns2.websupport.cz.\n@  86400  IN  NS   ns3.websupport.eu.<\/pre>\n\n\n\n<p class=\"wp-block-ht-blocks-messages wp-block-hb-message wp-block-hb-message--withicon is-style-info\"><strong>P\u0159\u00edklad nastaven\u00ed NS z\u00e1znam\u016f<\/strong><br>Va\u0161e dom\u00e9na mojedomena.cz nem\u00e1 u n\u00e1rodn\u00edho registr\u00e1tora (nap\u0159. CZ-NIC) nastaven\u00e9 NS z\u00e1znamy. Takto se v\u0161echny popt\u00e1vky po zadan\u00ed mojedomena.cz zastav\u00ed u n\u00e1rodn\u00edho registr\u00e1tora (nap\u0159. CZ-NIC) a nedojde k jejich zpracov\u00e1n\u00ed. Pokud v\u0161ak nastav\u00edte NS z\u00e1znamy na ns1.websupport.cz, ns2.websupport.cz, ns3.websupport.cz, tak v\u0161echny popt\u00e1vky p\u0159ijdou do WebSupportu, kde u\u017e podle DNS nastaven\u00ed zobraz\u00edme spr\u00e1vn\u00fd obsah.<\/p>\n\n\n\n<p><strong><a href=\"https:\/\/www.websupport.cz\/podpora\/kb\/ns-zaznamy\/\" target=\"_blank\" rel=\"noreferrer noopener\">N\u00e1vod pro nastaven\u00ed NS z\u00e1znam\u016f<\/a><\/strong><\/p>\n\n\n\n<div style=\"height:42px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">CNAME z\u00e1znamy<\/h3>\n\n\n\n<p>DNS z\u00e1znam typu CNAME slou\u017e\u00ed na p\u0159evzet\u00ed DNS nastaven\u00ed vzorov\u00e9 dom\u00e9ny. Tato p\u0159evzat\u00e1 nastaven\u00ed jsou nad\u0159azen\u00e1 vlastn\u00edm A a MX z\u00e1znam\u016fm dom\u00e9ny. V praxi to znamen\u00e1, \u017ee prohl\u00ed\u017ee\u010d nejd\u0159\u00edv zkontroluje nastaven\u00ed CNAME z\u00e1znamu a a\u017e kdy\u017e zjist\u00ed, \u017ee neexistuje, postupuje podle MX nebo A z\u00e1znam\u016f.<\/p>\n\n\n\n<p><strong>Jak vypad\u00e1 CNAME z\u00e1znam<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">shop  600  IN  CNAME   www.myshoptet.com.<\/pre>\n\n\n\n<p class=\"wp-block-ht-blocks-messages wp-block-hb-message wp-block-hb-message--withicon is-style-info\"><strong>P\u0159\u00edklad nastaven\u00ed CNAME z\u00e1znam\u016f<\/strong><br>Dom\u00e9na shop.mojedomena.cz m\u00e1 pomoc\u00ed CNAME z\u00e1znamu p\u0159i\u0159azen\u00fd z\u00e1znam www.myshoptet.com. To znamen\u00e1, \u017ee po zadan\u00ed adresy shop.mojedomena.cz se v prohl\u00ed\u017ee\u010di zobraz\u00ed obsah vytvo\u0159en\u00fd na slu\u017eb\u011b Shoptet.<\/p>\n\n\n\n<p><strong><a href=\"https:\/\/www.websupport.cz\/podpora\/kb\/cname-zaznamy\/\" target=\"_blank\" rel=\"noreferrer noopener\">N\u00e1vod pro nastaven\u00ed CNAME z\u00e1znam\u016f<\/a><\/strong><\/p>\n\n\n\n<div style=\"height:52px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">AAAA z\u00e1znamy<\/h3>\n\n\n\n<p>DNS z\u00e1znamy typu AAAA jsou alternativou k A z\u00e1znam\u016fm. Pou\u017e\u00edvaj\u00ed se v p\u0159\u00edpad\u011b, \u017ee adresa serveru, ze kter\u00e9ho chcete obsah na\u010d\u00edtat je v IPv6 form\u00e1tu.<\/p>\n\n\n\n<p><strong>Jak vypad\u00e1 AAAA z\u00e1znam<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">*  600  IN  AAAA   2A03: 2880: 2110: df07: face: b00c: 0:1.<\/pre>\n\n\n\n<p class=\"wp-block-ht-blocks-messages wp-block-hb-message wp-block-hb-message--withicon is-style-info\"><strong>P\u0159\u00edklad nastaven\u00ed AAAA z\u00e1znam\u016f<\/strong><br>Chcete nasm\u011brovat subdom\u00e9nu blog.mojedomena.cz na server s adresou 2A03: 2880: 2110: df07: face: b00c: 0: 1 (IPv6 facebook). Jak vid\u00edte, nejde o b\u011b\u017enou IP ve form\u00e1tu IPv4, kter\u00e9 pou\u017e\u00edv\u00e1te v A z\u00e1znamech. Je to IPv6 adresa a tu m\u016f\u017eete jednodu\u0161e pou\u017e\u00edt v AAAA z\u00e1znamu.<\/p>\n\n\n\n<p><strong><a href=\"https:\/\/www.websupport.cz\/podpora\/kb\/aaaa-zaznamy\/\" target=\"_blank\" rel=\"noreferrer noopener\">Postup&nbsp;pro&nbsp;zm\u011bnu&nbsp;AAAA&nbsp;z\u00e1znamu&nbsp;je&nbsp;stejn\u00fd,&nbsp;jako&nbsp;pro&nbsp;A&nbsp;z\u00e1znamy.<\/a><\/strong><\/p>\n\n\n\n<div style=\"height:39px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">TXT z\u00e1znamy<\/h3>\n\n\n\n<p>DNS z\u00e1znamy typu TXT slou\u017e\u00ed na&nbsp;<strong>p\u0159id\u00e1n\u00ed textov\u00fdch informac\u00ed&nbsp;<\/strong>do&nbsp;<strong>DNS z\u00e1znam\u016f<\/strong>&nbsp;dom\u00e9ny. To se \u010dasto vyu\u017e\u00edv\u00e1 pro&nbsp;<strong>ov\u011b\u0159en\u00ed dom\u00e9ny&nbsp;<\/strong>nebo dopl\u0148kov\u00e9 informace pot\u0159ebn\u00e9 k propojen\u00ed s dom\u00e9ny s extern\u00edmi slu\u017ebami.<br><\/p>\n\n\n\n<p><strong>Jak vypad\u00e1 TXT z\u00e1znam<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">vasedomena.tld  600  IN  TXT   \"google-site-verification= rXOxyZounnZasA8Z7oaD3c14JdjS9aKSWvsR1EbUSIQ\"<\/pre>\n\n\n\n<p class=\"wp-block-ht-blocks-messages wp-block-hb-message wp-block-hb-message--withicon is-style-info\"><strong>P\u0159\u00edklad nastaven\u00ed TXT z\u00e1znamu<\/strong><br>Pokud chcete pou\u017e\u00edt dom\u00e9nu ve slu\u017eb\u011b Google Apps, po registraci slu\u017eby budete vyzv\u00e1ni k ov\u011b\u0159en\u00ed vlastnictv\u00ed dom\u00e9ny. Jednou z mo\u017enost\u00ed je i p\u0159id\u00e1n\u00ed specifick\u00e9ho textu do DNS z\u00e1znam\u016f dom\u00e9ny. To dok\u00e1\u017eete pr\u00e1v\u011b p\u0159id\u00e1n\u00edm nov\u00e9ho TXT z\u00e1znamu.<\/p>\n\n\n\n<p><strong><a href=\"https:\/\/www.websupport.cz\/podpora\/kb\/txt-zaznamy\/\" target=\"_blank\" rel=\"noreferrer noopener\">Nastaven\u00ed TXT z\u00e1znamu<\/a><\/strong><\/p>\n\n\n\n<div style=\"height:48px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">SPF z\u00e1znamy<\/h3>\n\n\n\n<p><strong>SPF z\u00e1znam<\/strong><em>(Sender Policy Framework)<\/em>&nbsp;je typ&nbsp;<strong>TXT z\u00e1znamu<\/strong>, kter\u00fd obsahuje informace o tom, kter\u00e9 SMTP servery (IP adresy) jsou opr\u00e1vn\u011bn\u00e9 odes\u00edlat emaily z ur\u010dit\u00e9 dom\u00e9ny.&nbsp;C\u00edlem SPF je omezit fal\u0161ov\u00e1n\u00ed odesilatele v emailu a zabr\u00e1nit tak&nbsp;<strong>SPAMu.<\/strong><\/p>\n\n\n\n<p><strong>Jak vypad\u00e1 SPF z\u00e1znam<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">v=spf1 a mx include:_spf.websupport.sk ?all<\/pre>\n\n\n\n<p class=\"wp-block-ht-blocks-messages wp-block-hb-message wp-block-hb-message--withicon is-style-info\"><strong>P\u0159\u00edklad pou\u017eit\u00ed SPF z\u00e1znamu<\/strong><br>Tento z\u00e1znam hovo\u0159\u00ed o tom, \u017ee pro dom\u00e9nu vasedomena.tld je autoritativn\u00ed SMTP server smtp.websupport.cz. Pokud se ode\u0161le zpr\u00e1va p\u0159es smtp.web4u.cz, e-mailov\u00fd server, kter\u00fd podporuje kontrolu pomoc\u00ed SPF z\u00e1znamu, p\u0159ekontroluje uveden\u00e9 hodnoty. Jeliko\u017e IP adresa SMTP serveru z kter\u00e9 byla zpr\u00e1va odeslan\u00e1 (smtp.websupport.cz) odpov\u00edd\u00e1 SPF z\u00e1znamu, bude zpr\u00e1va d\u00e1le zpracovan\u00e1.<\/p>\n\n\n\n<p><strong><a href=\"https:\/\/www.websupport.cz\/podpora\/kb\/spf-zaznamy\/\" target=\"_blank\" rel=\"noreferrer noopener\">V\u00edce o SPF z\u00e1znamech<\/a><\/strong><\/p>\n\n\n\n<div style=\"height:54px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">SRV z\u00e1znamy<\/h3>\n\n\n\n<p>DNS z\u00e1znam typu <strong>SRV<\/strong> slou\u017e\u00ed na ur\u010den\u00ed adresy server\u016f pro specifick\u00e9 slu\u017eby. Specialitou SRV z\u00e1znam\u016f je, \u017ee umo\u017e\u0148uj\u00ed rozlo\u017een\u00ed z\u00e1t\u011b\u017ee na v\u00edcero adres na z\u00e1klad\u011b v\u00e1hy a priority.<\/p>\n\n\n\n<p><strong>Jak vypad\u00e1 SRV z\u00e1znam <\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">_xmpp-client._tcp.mojedomena.cz 1800 SRV 5 0 5222 talk.l.google.com<\/pre>\n\n\n\n<p class=\"wp-block-ht-blocks-messages wp-block-hb-message wp-block-hb-message--withicon is-style-info\"><strong>P\u0159\u00edklad nastaven\u00ed SRV z\u00e1znamu<\/strong><br>Pokud se v r\u00e1mci slu\u017eby Google Apps propojen\u00e9 s Va\u0161\u00ed dom\u00e9nou rozhodnete pou\u017e\u00edvat chat, budete vyzv\u00e1ni p\u0159idat do DNS z\u00e1znam\u016f dom\u00e9ny n\u011bco jako \u201c_xmpp-client._tcp.mojadomen.sk 1800 SRV 5 0 5222 talk.l.google.com\u201d. P\u0159esn\u011b na to V\u00e1m poslou\u017e\u00ed SRV z\u00e1znam.<\/p>\n\n\n\n<p><strong><a href=\"https:\/\/www.websupport.cz\/podpora\/kb\/srv-zaznamy\/\" target=\"_blank\" rel=\"noreferrer noopener\">Nastaven\u00ed SRV z\u00e1znamu<\/a><\/strong><\/p>\n\n\n\n<div style=\"height:37px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">CAA z\u00e1znamy<\/h3>\n\n\n\n<p><strong>Z\u00e1znam CAA<\/strong>&nbsp;(Certification Authority Authorization) \u2013 autorizace certifika\u010dn\u00ed autority, se pou\u017e\u00edv\u00e1 na ur\u010den\u00ed certifika\u010dn\u00ed autority (CA), kter\u00e1 m\u016f\u017ee vyd\u00e1vat SSL certifik\u00e1ty pro konkr\u00e9tn\u00ed dom\u00e9nu.&nbsp;<strong>Z\u00e1znamy CAA&nbsp;<\/strong>mohou nastavit pravidla pro celou dom\u00e9nu nebo pro konkr\u00e9tn\u00ed subdom\u00e9ny.<\/p>\n\n\n\n<p><strong>Jak vypad\u00e1 CAA z\u00e1znam<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">@  600  IN  CAA   128 issue \"letsencrypt.org\"<\/pre>\n\n\n\n<p><strong><a href=\"https:\/\/www.websupport.cz\/podpora\/kb\/caa-zaznamy\/\" target=\"_blank\" rel=\"noreferrer noopener\">Nastaven\u00ed CAA z\u00e1znamu<\/a><\/strong><\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">SSHFP z\u00e1znamy<\/h3>\n\n\n\n<p>DNS&nbsp;<strong>SSHFP z\u00e1znam<\/strong>&nbsp;<em>(Secure Shell fingerprint record)<\/em>&nbsp;obsahuje otisky ve\u0159ejn\u00fdch kl\u00ed\u010d\u016f, pou\u017eit\u00fdch pro SSH p\u0159ipojen\u00ed. Pou\u017e\u00edvaj\u00ed se zejm\u00e9na s dom\u00e9nami s povolen\u00fdm DNSSEC. Z\u00e1znam SSHFP se p\u0159i p\u0159ipojov\u00e1n\u00ed SSH klienta k serveru porovn\u00e1v\u00e1, a pokud jsou otisky z\u00e1znamu stejn\u00e9, jako ty na serveru, klient se m\u016f\u017ee bezpe\u010dn\u011b p\u0159ipojit.<\/p>\n\n\n\n<p><strong>Jak vypad\u00e1 SSHFP z\u00e1znam<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">host.example.com. 1800 SSHFP 2 1 123456789abcdef67890123456789abcdef67890<\/pre>\n\n\n\n<p><strong><a href=\"https:\/\/www.websupport.cz\/podpora\/kb\/sshfp-zaznamy\/\" target=\"_blank\" rel=\"noreferrer noopener\">Nastaven\u00ed SSHFP z\u00e1znamu<\/a><\/strong><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">TLSA z\u00e1znamy<\/h3>\n\n\n\n<p><strong>TLS autoriza\u010dn\u00ed z\u00e1znam<\/strong>&nbsp;(TLSA) se pou\u017e\u00edv\u00e1 na p\u0159i\u0159azen\u00ed TLS server certifik\u00e1tu nebo ve\u0159ejn\u00e9ho kl\u00ed\u010de k dom\u00e9n\u011b, na kter\u00e9 se z\u00e1znam nach\u00e1z\u00ed. Pomoc\u00ed TLSA z\u00e1znamu je mo\u017en\u00e9 ulo\u017eit otisk certifik\u00e1tu TLS \/ SSL do DNS va\u0161\u00ed dom\u00e9ny.<\/p>\n\n\n\n<p>TLSA z\u00e1znam m\u00e1 smysl generovat pouze tehdy, kdy\u017e je na dom\u00e9n\u011b aktivovan\u00fd DNSSEC, kdy je zaru\u010den\u00e1 d\u016fv\u011bryhodnost odpov\u011bdi z DNS.<\/p>\n\n\n\n<p><strong>Jak vypad\u00e1 TLSA z\u00e1znam<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">_100._tcp.www.domena.tld. IN TLSA 3 1 1 1fff7351cdb3957d2d3edd0f7d48bb6246f25361006c1f83379b85c6f3071adc<\/pre>\n\n\n\n<p><strong><a href=\"https:\/\/www.websupport.cz\/podpora\/kb\/tlsa-zaznamy\/\" target=\"_blank\" rel=\"noreferrer noopener\">Nastaven\u00ed TLSA z\u00e1znamu<\/a><\/strong><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">LOC z\u00e1znamy<\/h3>\n\n\n\n<p>Z\u00e1znam LOC se pou\u017e\u00edv\u00e1 na vyj\u00e1d\u0159en\u00ed informac\u00ed o geografick\u00e9m um\u00edst\u011bn\u00ed dom\u00e9ny. Z\u00e1znam DNS vy\u017eaduje informace jako: stupn\u011b zem\u011bpisn\u00e9 \u0161\u00ed\u0159ky (d1) [0..90], stupn\u011b zem\u011bpisn\u00e9 d\u00e9lky (d2) [0..180], minuty zem\u011bpisn\u00e9 \u0161\u00ed\u0159ky a d\u00e9lky (m1, m2) [0..59], sekundy zem\u011bpisn\u00e9 \u0161\u00ed\u0159ky a d\u00e9lky (s1,s2) [0..59.999], nadmo\u0159sk\u00e1 v\u00fd\u0161ka v metrech (alt) [-100000,00..42849672,95] a velikost \/ p\u0159esnost v metrech (siz, hp, vp) [0..90000000,00]<\/p>\n\n\n\n<p><strong>Jak vypad\u00e1 LOC z\u00e1znam<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">LOC record statdns.net.   IN LOC   52 22 23.000 N 4 53 32.000 E -2.00m 0.00m 10000m 10m<\/pre>\n\n\n\n<p><strong><a href=\"https:\/\/www.websupport.cz\/podpora\/kb\/loc-zaznamy\/\" target=\"_blank\" rel=\"noreferrer noopener\">Nastaven\u00ed LOC z\u00e1znamu<\/a><\/strong><\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">CERT z\u00e1znamy<\/h3>\n\n\n\n<p>Z\u00e1znam LOC sa pou\u017e\u00edva na vyjadrenie inform\u00e1ci\u00ed o geografickom umiestnen\u00ed dom\u00e9ny. Z\u00e1znamy CERT ukl\u00e1daj\u00ed certifik\u00e1ty a Certificate revocation list (CRL) pro kryptografick\u00e9 kl\u00ed\u010de. DNS z\u00e1znam vy\u017eaduje informace jako typ certifik\u00e1tu [0..65535], key tag [0..65535], pou\u017eit\u00fd algoritmus [0-65535], certifik\u00e1t nebo CRL v Base 64 form\u00e1tu.<\/p>\n\n\n\n<p><strong><a href=\"https:\/\/www.websupport.cz\/podpora\/kb\/cert-zaznamy\/\" target=\"_blank\" rel=\"noreferrer noopener\">Nastaven\u00ed CERT z\u00e1znamu<\/a><\/strong><\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">DNS Check<\/h2>\n\n\n\n<p>Jak\u00e9 m\u00e1 konkr\u00e9tn\u00ed dom\u00e9na nastaven\u00e9 DNS z\u00e1znamy m\u016f\u017eeme zkontrolovat v\u00edcero zp\u016fsoby.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">DNS checker<\/h3>\n\n\n\n<p>Nap\u0159\u00edklad na <strong><a href=\"https:\/\/dnschecker.org\/\" target=\"_blank\" rel=\"noreferrer noopener\">t\u00e9to<\/a><\/strong> adrese najdeme mo\u017enost prohl\u00e9dnout si nejzn\u00e1m\u011bj\u0161\u00ed DNS z\u00e1znamy. Sta\u010d\u00ed zadat n\u00e1zev dom\u00e9ny (nebo subdom\u00e9ny) a zvolit, kter\u00fd z\u00e1znam chceme zkontrolovat.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">P\u0159\u00edkazov\u00fd \u0159\u00e1dek<\/h3>\n\n\n\n<p>Jak\u00e9 m\u00e1 dom\u00e9na nastaven\u00e9 DNS z\u00e1znamy si m\u016f\u017eeme zkontrolovat i p\u0159es termin\u00e1l podporuj\u00edc\u00ed host p\u0159\u00edkaz. Nap\u0159\u00edklad kdy\u017e chceme v\u011bd\u011bt, jak\u00fd <strong>DNS A z\u00e1znam<\/strong> m\u00e1 dom\u00e9na websupport.cz, pou\u017eijeme p\u0159\u00edkaz:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><em><strong>host -t a websupport.cz<\/strong><\/em>\n\n<em>websupport.cz has address 37.9.169.171\nwebsupport.cz has address 37.9.169.172\nwebsupport.cz has address 37.9.169.173<\/em><\/pre>\n\n\n\n<p><br>Stejn\u011b tak si m\u016f\u017eeme zkontrolovat jin\u00e9 DNS z\u00e1znamy, nap\u0159\u00edklad <strong>DNS MX z\u00e1znamy<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><strong><em>host -t mx websupport.<\/em><\/strong>cz\n\n<em>websupport.cz mail is handled by 5 mailin1.websupport.cz.\nwebsupport.cz mail is handled by 10 mailin2.websupport.cz<\/em>.<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Syst\u00e9m DNS z\u00e1znam\u016f slou\u017e\u00ed na internetu a na po\u010d\u00edta\u010dov\u00fdch s\u00edt\u00edch na p\u0159ekl\u00e1d\u00e1n\u00ed dom\u00e9nov\u00fdch n\u00e1zv\u016f na IP adresy a zabezpe\u010duje tak zjednodu\u0161en\u00ed komunikace a pohybu na internetu. &nbsp;\u010casto je p\u0159irovn\u00e1van\u00fd k telefonn\u00edmu seznamu, p\u0159i\u0159azuje toti\u017e IP adres\u00e1m slovn\u00ed (dom\u00e9nov\u00fd) n\u00e1zev. U\u017eivatel si d\u00edky&nbsp;DNS nemus\u00ed pamatovat IP adresu str\u00e1nky, ale pouze n\u00e1zev&#8230;<\/p>\n","protected":false},"author":3,"template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[12,75],"ht-kb-tag":[],"class_list":["post-330","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-dns-zaznamy","ht_kb_category-domeny"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Co je to DNS - Websupport Centrum n\u00e1pov\u011bdy<\/title>\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.websupport.cz\/podpora\/kb\/co-je-to-dns\/\" \/>\n<meta property=\"og:locale\" content=\"cs_CZ\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Co je to DNS - Websupport Centrum n\u00e1pov\u011bdy\" \/>\n<meta property=\"og:description\" content=\"Syst\u00e9m DNS z\u00e1znam\u016f slou\u017e\u00ed na internetu a na po\u010d\u00edta\u010dov\u00fdch s\u00edt\u00edch na p\u0159ekl\u00e1d\u00e1n\u00ed dom\u00e9nov\u00fdch n\u00e1zv\u016f na IP adresy a zabezpe\u010duje tak zjednodu\u0161en\u00ed komunikace a pohybu na internetu. &nbsp;\u010casto je p\u0159irovn\u00e1van\u00fd k telefonn\u00edmu seznamu, p\u0159i\u0159azuje toti\u017e IP adres\u00e1m slovn\u00ed (dom\u00e9nov\u00fd) n\u00e1zev. 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