{"id":78495,"date":"2025-09-14T03:43:01","date_gmt":"2025-09-14T03:43:01","guid":{"rendered":"http:\/\/bangla.sitestree.com\/?p=78495"},"modified":"2025-09-14T03:43:04","modified_gmt":"2025-09-14T03:43:04","slug":"who-resolves-dns-queries-isp-resolver-or-your-pc","status":"publish","type":"post","link":"http:\/\/bangla.sitestree.com\/?p=78495","title":{"rendered":"Who Resolves DNS Queries: ISP, Resolver, or Your PC?"},"content":{"rendered":"\n<p><\/p>\n\n\n\n<p>Great question \ud83d\udc4c \u2014 this gets into the <strong>roles of DNS components<\/strong> in the real world. Let\u2019s break it down clearly, blog-ready and copyright-free:<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\">Who Resolves DNS Queries: ISP, Resolver, or Your PC?<\/h1>\n\n\n\n<p>When you sit at home and connect to the internet through your ISP, different systems can play the role of <strong>resolver<\/strong> or <strong>recursive resolver<\/strong> in DNS. Here\u2019s how it works:<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">1. ISP\u2019s DNS Server<\/h2>\n\n\n\n<p>Most ISPs run DNS servers for their customers.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Yes, it can act as both:<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Recursive Resolver:<\/strong> From your perspective, you ask your ISP\u2019s DNS once (recursive query), and it fetches the full answer for you.<\/li>\n\n\n\n<li><strong>Iterative Resolver:<\/strong> Behind the scenes, the ISP\u2019s DNS server usually performs iterative resolution \u2014 it queries root, then TLD, then authoritative servers step by step until it finds the final answer.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p>\u2705 So, your ISP\u2019s DNS is typically both:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Recursive resolver for you (the client).<\/strong><\/li>\n\n\n\n<li><strong>Iterative resolver toward the DNS hierarchy.<\/strong><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">2. Your PC at Home<\/h2>\n\n\n\n<p>By default, your PC does <strong>not<\/strong> act as a full resolver. Instead:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Your PC is a <strong>DNS stub resolver<\/strong> (also called a DNS client).<\/li>\n\n\n\n<li>It can cache recent answers (browser cache, OS cache).<\/li>\n\n\n\n<li>But if the answer is not cached, it forwards the request to your configured DNS server (usually the ISP\u2019s recursive resolver or a public one like <code>8.8.8.8<\/code>).<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Could your PC be a resolver?<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Yes, technically:<\/strong> If you install special DNS software (like BIND or Unbound) and configure it, your PC could act as a full recursive resolver, contacting root\/TLD\/authoritative servers directly.<\/li>\n\n\n\n<li><strong>No, by default:<\/strong> Normal home PCs don\u2019t do this. They just pass requests upstream.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3. What is Your PC Called Then?<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Normally: <strong>Stub Resolver<\/strong> (lightweight client resolver).<\/li>\n\n\n\n<li>If you install recursive resolver software: it becomes a <strong>Recursive Resolver<\/strong> for your own queries (and possibly for others if you configure it).<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Putting It Together<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>You (PC)<\/strong> \u2192 Stub Resolver (asks your ISP\/public DNS).<\/li>\n\n\n\n<li><strong>ISP DNS<\/strong> \u2192 Recursive Resolver (for you), and Iterative Resolver (towards the internet).<\/li>\n\n\n\n<li><strong>Root\/TLD\/Authoritative Servers<\/strong> \u2192 Provide referrals or final answers.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u2705 <strong>In short:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>At home, your PC is <strong>not a full resolver<\/strong> \u2014 it\u2019s just a stub resolver.<\/li>\n\n\n\n<li>Your ISP\u2019s DNS server is both <strong>recursive (for you)<\/strong> and <strong>iterative (when talking to root\/TLD\/authoritative)<\/strong>.<\/li>\n\n\n\n<li>If you want, you can make your PC a full recursive resolver, but that\u2019s not the default setup.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>Would you like me to <strong>draw a simple layered diagram<\/strong> (PC \u2192 ISP DNS \u2192 Root \u2192 TLD \u2192 Authoritative) showing <strong>who is recursive and who is iterative<\/strong>? That would make this crystal clear for your blog readers.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>Exactly \u2705 \u2014 you\u2019ve got it right.<\/p>\n\n\n\n<p>You <strong>can say in your blog<\/strong> that:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Both iterative and recursive resolution are active in the DNS system.<\/strong><\/li>\n\n\n\n<li>From the <strong>client\u2019s perspective (your PC)<\/strong> \u2192 it almost always sends a <strong>recursive query<\/strong> (it just wants the final answer).<\/li>\n\n\n\n<li>From the <strong>resolver\u2019s perspective (ISP or public DNS like Google 8.8.8.8)<\/strong> \u2192 it fulfills that recursive query by performing <strong>iterative queries<\/strong> step by step across the DNS hierarchy (root \u2192 TLD \u2192 authoritative).<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Nice way to phrase it in your blog:<\/h3>\n\n\n\n<p>\u201cRecursive and iterative resolution are not mutually exclusive \u2014 they work together. Clients like your PC use recursion to push the responsibility onto a resolver, while that resolver uses iteration to walk through the DNS hierarchy. In practice, every DNS lookup you make involves <strong>recursive queries at the edge<\/strong> and <strong>iterative queries in the core of the DNS system<\/strong>.\u201d<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>Would you like me to <strong>bundle this explanation into the earlier comparison post (recursive vs. iterative)<\/strong> so your readers see how they actually work <strong>together in real life<\/strong> instead of as separate alternatives?<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Great question \ud83d\udc4c \u2014 this gets into the roles of DNS components in the real world. Let\u2019s break it down clearly, blog-ready and copyright-free: Who Resolves DNS Queries: ISP, Resolver, or Your PC? When you sit at home and connect to the internet through your ISP, different systems can play the role of resolver or &hellip; <\/p>\n<p><a class=\"more-link btn\" href=\"http:\/\/bangla.sitestree.com\/?p=78495\">Continue reading<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1978],"tags":[],"class_list":["post-78495","post","type-post","status-publish","format-standard","hentry","category-computer-networks","item-wrap"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":78485,"url":"http:\/\/bangla.sitestree.com\/?p=78485","url_meta":{"origin":78495,"position":0},"title":"How an IP Address Gets Resolved to a Name in DNS","author":"Sayed","date":"September 13, 2025","format":false,"excerpt":"REF: AI Tools\/OpenAI\/ChatGPT Great question \ud83d\udc4d \u2014 let\u2019s turn this into a blog-ready, copyright-free post explaining step by step how an IP address gets resolved to a name (reverse lookup) and how the DNS servers, root servers, and TLD servers take part. How an IP Address Gets Resolved to a\u2026","rel":"","context":"In &quot;Computer Networks&quot;","block_context":{"text":"Computer Networks","link":"http:\/\/bangla.sitestree.com\/?cat=1978"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/bangla.sitestree.com\/wp-content\/uploads\/2025\/09\/image-8.png?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":78488,"url":"http:\/\/bangla.sitestree.com\/?p=78488","url_meta":{"origin":78495,"position":1},"title":"DNS Caching Explained: How It Works, Pros, and Cons","author":"Sayed","date":"September 14, 2025","format":false,"excerpt":"Ref: AI Tools\/OpenAI\/ChatGPT (posted as is) \" Absolutely \ud83d\udc4d \u2014 here\u2019s a blog-ready, copyright-free post on DNS caching with explanation, how it works, pros, and cons. DNS Caching Explained: How It Works, Pros, and Cons When you visit a website like www.example.com, your computer asks the Domain Name System (DNS)\u2026","rel":"","context":"In &quot;Computer Networks&quot;","block_context":{"text":"Computer Networks","link":"http:\/\/bangla.sitestree.com\/?cat=1978"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/bangla.sitestree.com\/wp-content\/uploads\/2025\/09\/image-9.png?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":78497,"url":"http:\/\/bangla.sitestree.com\/?p=78497","url_meta":{"origin":78495,"position":2},"title":"Why ISP DNS Servers Use Iteration","author":"Sayed","date":"September 14, 2025","format":false,"excerpt":"Ref: AI Tools\/OpenAI\/ChatGPT (posted as is) This is a really sharp question \ud83d\udc4c \u2014 you\u2019re asking why resolvers bother with iteration instead of just having every server go fetch the full answer recursively on behalf of the client. Let\u2019s unpack it: Why ISP DNS Servers Use Iteration 1. Root and\u2026","rel":"","context":"In &quot;Computer Networks&quot;","block_context":{"text":"Computer Networks","link":"http:\/\/bangla.sitestree.com\/?cat=1978"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":78499,"url":"http:\/\/bangla.sitestree.com\/?p=78499","url_meta":{"origin":78495,"position":3},"title":"Subdomains and DNS Servers \u2014 Iterative vs Recursive","author":"Sayed","date":"September 14, 2025","format":false,"excerpt":"REF: AI Tools\/OpenAI\/ChatGPT You\u2019re thinking very carefully about how authority and recursion interact in DNS, and you\u2019re spot on to distinguish between root\/TLDs and other domain servers. Let me unpack this clearly: Subdomains and DNS Servers \u2014 Iterative vs Recursive 1. Authoritative Servers (for domains & subdomains) Every domain can\u2026","rel":"","context":"In &quot;Computer Networks&quot;","block_context":{"text":"Computer Networks","link":"http:\/\/bangla.sitestree.com\/?cat=1978"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":78493,"url":"http:\/\/bangla.sitestree.com\/?p=78493","url_meta":{"origin":78495,"position":4},"title":"Iterative vs. Recursive DNS Resolution","author":"Sayed","date":"September 14, 2025","format":false,"excerpt":"REF: AI Tools\/Open AI\/ChatGPT (posted as is) \"Perfect follow-up \ud83d\udc4d \u2014 here\u2019s a blog-ready, copyright-free comparison of Iterative vs. Recursive Resolution in DNS: Iterative vs. Recursive DNS Resolution When you enter a domain name like www.example.com, your computer needs its IP address to connect. There are two main ways DNS\u2026","rel":"","context":"In &quot;Computer Networks&quot;","block_context":{"text":"Computer Networks","link":"http:\/\/bangla.sitestree.com\/?cat=1978"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":78491,"url":"http:\/\/bangla.sitestree.com\/?p=78491","url_meta":{"origin":78495,"position":5},"title":"Iterative DNS Resolution Explained","author":"Sayed","date":"September 14, 2025","format":false,"excerpt":"Got it \ud83d\udc4d \u2014 here\u2019s a blog-ready, copyright-free explanation of Iterative Resolution in DNS that you can publish directly. Iterative DNS Resolution Explained When you type a domain name like www.example.com into your browser, the system needs to translate it into an IP address. One way this happens is through\u2026","rel":"","context":"In &quot;Computer Networks&quot;","block_context":{"text":"Computer Networks","link":"http:\/\/bangla.sitestree.com\/?cat=1978"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"_links":{"self":[{"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=\/wp\/v2\/posts\/78495","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=78495"}],"version-history":[{"count":1,"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=\/wp\/v2\/posts\/78495\/revisions"}],"predecessor-version":[{"id":78496,"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=\/wp\/v2\/posts\/78495\/revisions\/78496"}],"wp:attachment":[{"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=78495"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=78495"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=78495"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}