{"id":7526,"date":"2023-08-25T00:00:00","date_gmt":"2023-08-25T00:00:00","guid":{"rendered":"https:\/\/tech-lib.eu\/tech\/jak-funguje-nslookup\/"},"modified":"2023-08-25T00:00:00","modified_gmt":"2023-08-25T00:00:00","slug":"jak-funguje-nslookup","status":"publish","type":"post","link":"https:\/\/tech-lib.eu\/tech\/jak-funguje-nslookup\/","title":{"rendered":"Jak funguje nslookup?"},"content":{"rendered":"<div class=\"articlecontent\">\n<div class=\"newlinediv\"><\/div>\n<p> Spr\u00e1vci s\u00edt\u00ed a IT specialist\u00e9 mohou nslookup pou\u017e\u00edvat jako u\u017eite\u010dn\u00fd n\u00e1stroj p\u0159i lad\u011bn\u00ed probl\u00e9m\u016f se s\u00ed\u0165ov\u00fdm p\u0159ipojen\u00edm nebo kontrole nastaven\u00ed DNS. N\u00e1stroj p\u0159\u00edkazov\u00e9ho \u0159\u00e1dku nslookup, co\u017e je zkratka pro &#8222;name server lookup&#8220;, umo\u017e\u0148uje u\u017eivatel\u016fm zad\u00e1vat dotazy do syst\u00e9mu DNS (Domain Name System) a zji\u0161\u0165ovat informace o dom\u00e9nov\u00fdch jm\u00e9nech, IP adres\u00e1ch a dal\u0161\u00edch z\u00e1znamech DNS. V tomto p\u0159\u00edsp\u011bvku se budeme zab\u00fdvat funkcemi n\u00e1stroje nslookup a jeho r\u016fzn\u00fdmi aplikacemi. <\/p>\n<div class=\"newlinediv\"><\/div>\n<p> Abyste mohli nslookup pou\u017e\u00edvat k vyhled\u00e1v\u00e1n\u00ed v syst\u00e9mu DNS, mus\u00edte na sv\u00e9m po\u010d\u00edta\u010di spustit p\u0159\u00edkazov\u00e9 okno nebo okno termin\u00e1lu. Po p\u0159\u00edchodu tam jednodu\u0161e zadejte &#8222;nslookup&#8220; a n\u00e1zev dom\u00e9ny nebo IP adresu, kterou chcete vyhledat. Pot\u00e9 nslookup provede vol\u00e1n\u00ed na server DNS a z\u00edsk\u00e1 pot\u0159ebn\u00e9 \u00fadaje. Ve v\u00fdchoz\u00edm nastaven\u00ed pou\u017e\u00edv\u00e1 nslookup server DNS va\u0161eho syst\u00e9mu, ale zad\u00e1n\u00edm &#8222;server&#8220; a IP adresy po\u017eadovan\u00e9ho serveru DNS m\u016f\u017eete vybrat jin\u00fd server DNS. <\/p>\n<div class=\"newlinediv\"><\/div>\n<p> P\u0159i pou\u017eit\u00ed p\u0159\u00edkazu nslookup je nejprve kontaktov\u00e1n v\u00fdchoz\u00ed server DNS nebo zadan\u00fd server DNS. Ten ode\u0161le paket s dotazem DNS, kter\u00fd obsahuje zadanou IP adresu nebo n\u00e1zev dom\u00e9ny. Po zpracov\u00e1n\u00ed dotazu server DNS vyhled\u00e1 ve sv\u00e9 datab\u00e1zi pot\u0159ebn\u00e9 \u00fadaje. Po nalezen\u00ed shody ode\u0161le server DNS zp\u011bt do po\u010d\u00edta\u010de paket s odpov\u011bd\u00ed obsahuj\u00edc\u00ed po\u017eadovan\u00e9 \u00fadaje, nap\u0159\u00edklad IP adresu pro n\u00e1zev dom\u00e9ny. <\/p>\n<div class=\"newlinediv\"><\/div>\n<p> IP adresu, n\u00e1zev dom\u00e9ny a dal\u0161\u00ed relevantn\u00ed \u00fadaje z dotazu DNS zobraz\u00ed nslookup na obrazovce. Krom\u011b toho nab\u00edz\u00ed informace, jako je n\u00e1zev a IP adresa serveru DNS, kter\u00fd na dotaz odpov\u011bd\u011bl. Nslookup skute\u010dn\u011b zobrazuje IP adresy, ano. IP adresa p\u0159ipojen\u00e1 k n\u00e1zvu dom\u00e9ny je jednou z kl\u00ed\u010dov\u00fdch informac\u00ed poskytovan\u00fdch p\u0159i prov\u00e1d\u011bn\u00ed dotazu DNS pomoc\u00ed n\u00e1stroje nslookup. Nav\u00e1z\u00e1n\u00ed s\u00ed\u0165ov\u00e9ho p\u0159ipojen\u00ed a povolen\u00ed p\u0159ipojen\u00ed za\u0159\u00edzen\u00ed tyto informace vy\u017eaduje. <\/p>\n<div class=\"newlinediv\"><\/div>\n<p> Do samotn\u00e9ho postupu vyhled\u00e1v\u00e1n\u00ed DNS je zapojeno n\u011bkolik proces\u016f. P\u0159i zad\u00e1v\u00e1n\u00ed n\u00e1zvu dom\u00e9ny v n\u00e1stroji nslookup se nejprve zkontroluje mezipam\u011b\u0165 DNS v m\u00edstn\u00edm syst\u00e9mu. Pokud dojde ke shod\u011b s mezipam\u011bt\u00ed, co\u017e znamen\u00e1, \u017ee data jsou ji\u017e ulo\u017eena v m\u00edstn\u00ed mezipam\u011bti, je IP adresa na\u010dtena p\u0159\u00edmo z mezipam\u011bti pomoc\u00ed n\u00e1stroje nslookup. Pokud nen\u00ed nalezena shoda s mezipam\u011bt\u00ed, dotazuje se nslookup nakonfigurovan\u00e9ho nebo v\u00fdchoz\u00edho serveru DNS, jak bylo pops\u00e1no d\u0159\u00edve. <\/p>\n<div class=\"newlinediv\"><\/div>\n<p> N\u00e1zev dom\u00e9ny je p\u0159ekl\u00e1d\u00e1n pomoc\u00ed hierarchick\u00e9ho sch\u00e9matu serverem DNS, kter\u00fd obdr\u017e\u00ed po\u017eadavek. Za\u010dne t\u00edm, \u017ee se pod\u00edv\u00e1 do sv\u00e9 vlastn\u00ed mezipam\u011bti a zjist\u00ed, zda se tam po\u017eadovan\u00e1 data nach\u00e1zej\u00ed. Pokud ne, kontaktuje dal\u0161\u00ed servery DNS v hierarchii, dokud nenajde autoritativn\u00ed server DNS dom\u00e9ny. Z\u00e1znamy DNS pro ur\u010ditou dom\u00e9nu aktualizuje autoritativn\u00ed server DNS. Po\u017eadovan\u00e1 data pak autoritativn\u00ed server DNS z\u00edsk\u00e1 po jejich identifikaci a ode\u0161le je zp\u011bt v paketu odpov\u011bdi, kter\u00fd pak zobraz\u00ed nslookup. <\/p>\n<div class=\"newlinediv\"><\/div>\n<p> A\u010dkoli je nslookup \u00fa\u010dinn\u00fdm n\u00e1strojem pro vy\u017e\u00e1d\u00e1n\u00ed informac\u00ed DNS, je t\u0159eba poznamenat, \u017ee se li\u0161\u00ed od samotn\u00e9ho syst\u00e9mu DNS. Distribuovan\u00fd syst\u00e9m zvan\u00fd DNS neboli Domain Name System p\u0159ev\u00e1d\u00ed dom\u00e9nov\u00e1 jm\u00e9na na IP adresy a naopak. Jedn\u00e1 se o nezbytnou sou\u010d\u00e1st internetov\u00e9 architektury, kter\u00e1 n\u00e1m umo\u017e\u0148uje p\u0159istupovat k webov\u00fdm str\u00e1nk\u00e1m a slu\u017eb\u00e1m pomoc\u00ed snadno zapamatovateln\u00fdch dom\u00e9nov\u00fdch jmen nam\u00edsto p\u0159\u00edm\u00e9ho zad\u00e1v\u00e1n\u00ed jejich IP adres. Na druh\u00e9 stran\u011b je Nslookup n\u00e1stroj, kter\u00fd umo\u017e\u0148uje u\u017eivatel\u016fm komunikovat se servery DNS a z\u00edsk\u00e1vat data souvisej\u00edc\u00ed s DNS. <\/p>\n<div class=\"newlinediv\"><\/div>\n<p> nslookup je flexibiln\u00ed n\u00e1stroj p\u0159\u00edkazov\u00e9ho \u0159\u00e1dku, kter\u00fd nab\u00edz\u00ed rychl\u00fd a efektivn\u00ed zp\u016fsob dotazov\u00e1n\u00ed syst\u00e9mu DNS na informace o n\u00e1zvech dom\u00e9n a IP adres\u00e1ch. Spr\u00e1vci s\u00edt\u00ed a IT specialist\u00e9 mohou diagnostikovat s\u00ed\u0165ov\u00e9 probl\u00e9my, potvrdit konfigurace DNS a z\u00edskat u\u017eite\u010dn\u00e9 informace o procesu vyhled\u00e1v\u00e1n\u00ed DNS, pokud pochop\u00ed, jak nslookup funguje, a vyu\u017eij\u00ed jeho funkce.<\/p><\/div>\n<div class=\"questions\">\n<div class=\"questionstitle\">FAQ<\/div>\n<div class=\"question\">\n<div class=\"qtitle\"> Co je nslookup jednodu\u0161e \u0159e\u010deno?<\/div>\n<p> Laicky \u0159e\u010deno, nslookup je program nebo n\u00e1stroj p\u0159\u00edkazov\u00e9ho \u0159\u00e1dku, kter\u00fd slou\u017e\u00ed k dotazov\u00e1n\u00ed syst\u00e9mu DNS (Domain Name System) za \u00fa\u010delem z\u00edsk\u00e1n\u00ed informac\u00ed o n\u00e1zvech dom\u00e9n, IP adres\u00e1ch a dal\u0161\u00edch relevantn\u00edch polo\u017ek\u00e1ch DNS. Umo\u017e\u0148uje vyhledat a z\u00edskat konkr\u00e9tn\u00ed \u00fadaje o dom\u00e9n\u011b, nap\u0159\u00edklad IP adresu, kter\u00e1 je k n\u00ed p\u0159ipojena, informace o po\u0161tovn\u00edm serveru nebo jmenn\u00e9m serveru, kter\u00fd m\u00e1 danou dom\u00e9nu na starosti. Spr\u00e1vci s\u00edt\u00ed, webov\u00ed n\u00e1vrh\u00e1\u0159i a u\u017eivatel\u00e9, kte\u0159\u00ed pot\u0159ebuj\u00ed vy\u0159e\u0161it probl\u00e9my nebo z\u00edskat \u00fadaje o ur\u010dit\u00e9 dom\u00e9n\u011b nebo webov\u00e9 str\u00e1nce, \u010dasto pou\u017e\u00edvaj\u00ed nslookup. <\/p>\n<\/div>\n<div class=\"question\">\n<div class=\"qtitle\"> Jak zkontrolovat DNS z IP adresy?<\/div>\n<p> Ke kontrole DNS z IP adresy m\u016f\u017eete pou\u017e\u00edt n\u00e1stroj p\u0159\u00edkazov\u00e9ho \u0159\u00e1dku nslookup. Postup je n\u00e1sleduj\u00edc\u00ed: <\/p>\n<div class=\"newlinediv\"><\/div>\n<p> 1. Spus\u0165te termin\u00e1l nebo p\u0159\u00edkazov\u00fd \u0159\u00e1dek za\u0159\u00edzen\u00ed. 2. Zadejte &#8222;nslookup&#8220; a pot\u00e9 mezeru. <\/p>\n<div class=\"newlinediv\"><\/div>\n<p> 3. Zadejte IP adresu, kterou chcete ov\u011b\u0159it, nap\u0159\u00edklad: nslookup 192.168.0.1 <\/p>\n<div class=\"newlinediv\"><\/div>\n<p> &#8220;&#8216; <\/p>\n<div class=\"newlinediv\"><\/div>\n<p> &#8220;&#8216; <\/p>\n<div class=\"newlinediv\"><\/div>\n<p> 4. Stiskn\u011bte kl\u00e1vesu Enter. <\/p>\n<div class=\"newlinediv\"><\/div>\n<p> Program nslookup se spoj\u00ed se serverem DNS a zjist\u00ed podrobnosti o dan\u00e9 IP adrese. Zobraz\u00ed se tak\u00e9 server DNS odpov\u011bdn\u00fd za p\u0159eklad IP adresy a doprovodn\u00fd n\u00e1zev dom\u00e9ny (pokud je k dispozici). M\u016f\u017ee tak\u00e9 nab\u00eddnout dal\u0161\u00ed informace, nap\u0159\u00edklad hodnotu TTL (time to live), kter\u00e1 ud\u00e1v\u00e1, jak dlouho je z\u00e1znam DNS platn\u00fd. <\/p>\n<div class=\"newlinediv\"><\/div>\n<p> Pomoc\u00ed n\u00e1stroje nslookup m\u016f\u017eete rychle ov\u011b\u0159it \u00fadaje DNS t\u00fdkaj\u00edc\u00ed se ur\u010dit\u00e9 IP adresy. <\/p>\n<\/div>\n<div class=\"question\">\n<div class=\"qtitle\"> Jak pou\u017e\u00edt nslookup IP adresy?<\/div>\n<p> Chcete-li pou\u017e\u00edt nslookup s IP adresou, je t\u0159eba dodr\u017eet n\u00ed\u017ee uveden\u00e9 postupy: 1. V po\u010d\u00edta\u010di spus\u0165te termin\u00e1l nebo p\u0159\u00edkazov\u00fd \u0159\u00e1dek. 2. Zadejte &#8222;nslookup&#8220; a pot\u00e9 mezeru. 3. Zadejte IP adresu, kterou chcete zkontrolovat. Pokud by adresa IP byla nap\u0159\u00edklad 192.168.0.1, zadali byste &#8222;nslookup 192.168.0.1&#8220;. 4. Stiskn\u011bte kl\u00e1vesu &#8222;Enter&#8220;. <\/p>\n<div class=\"newlinediv\"><\/div>\n<p> Pot\u00e9 Nslookup provede reverzn\u00ed vyhled\u00e1v\u00e1n\u00ed DNS, aby zjistil n\u00e1zev hostitele p\u0159ipojen\u00fd k dan\u00e9 IP adrese. Spolu s dal\u0161\u00edmi \u00fadaji, jako je IP adresa, pou\u017eit\u00fd server DNS a \u010das dotazu, se zobraz\u00ed n\u00e1zev hostitele.<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Spr\u00e1vci s\u00edt\u00ed a IT specialist\u00e9 mohou nslookup pou\u017e\u00edvat jako u\u017eite\u010dn\u00fd n\u00e1stroj p\u0159i lad\u011bn\u00ed probl\u00e9m\u016f se s\u00ed\u0165ov\u00fdm p\u0159ipojen\u00edm nebo kontrole nastaven\u00ed DNS. N\u00e1stroj p\u0159\u00edkazov\u00e9ho \u0159\u00e1dku nslookup, co\u017e je zkratka pro &#8222;name server lookup&#8220;, umo\u017e\u0148uje u\u017eivatel\u016fm zad\u00e1vat dotazy do syst\u00e9mu DNS (Domain Name System) a zji\u0161\u0165ovat informace o dom\u00e9nov\u00fdch jm\u00e9nech, IP adres\u00e1ch a dal\u0161\u00edch z\u00e1znamech DNS. V &#8230; <a title=\"Jak funguje nslookup?\" class=\"read-more\" href=\"https:\/\/tech-lib.eu\/tech\/jak-funguje-nslookup\/\" aria-label=\"\u010c\u00edst v\u00edce o Jak funguje nslookup?\">\u010c\u00edst d\u00e1l<\/a><\/p>\n","protected":false},"author":1316,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[33],"tags":[],"class_list":["post-7526","post","type-post","status-publish","format-standard","hentry","category-networking"],"_links":{"self":[{"href":"https:\/\/tech-lib.eu\/tech\/wp-json\/wp\/v2\/posts\/7526","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tech-lib.eu\/tech\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tech-lib.eu\/tech\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tech-lib.eu\/tech\/wp-json\/wp\/v2\/users\/1316"}],"replies":[{"embeddable":true,"href":"https:\/\/tech-lib.eu\/tech\/wp-json\/wp\/v2\/comments?post=7526"}],"version-history":[{"count":0,"href":"https:\/\/tech-lib.eu\/tech\/wp-json\/wp\/v2\/posts\/7526\/revisions"}],"wp:attachment":[{"href":"https:\/\/tech-lib.eu\/tech\/wp-json\/wp\/v2\/media?parent=7526"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tech-lib.eu\/tech\/wp-json\/wp\/v2\/categories?post=7526"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tech-lib.eu\/tech\/wp-json\/wp\/v2\/tags?post=7526"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}