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<!DOCTYPE html>
<html lang="en" data-bs-theme="dark">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>DNS Dictionary – NicTool</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.8/dist/css/bootstrap.min.css"
integrity="sha384-sRIl4kxILFvY47J16cr9ZwB07vP4J8+LH7qKQnuqkuIAvNWLzeN8tE5YBujZqJLB" crossorigin="anonymous" />
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<p class="nt-section-label">Reference</p>
<h1 class="h3 fw-bold text-white mb-2">DNS Dictionary</h1>
<p style="color:var(--nt-muted);font-size:.93rem">
Plain-language definitions for common DNS terminology.
Use the <a href="builder/index.html">DNS Record Builder</a> to generate records using these terms.
</p>
</div>
<!-- Quick-jump -->
<div class="card mb-5">
<div class="card-body py-3 px-4 d-flex flex-wrap gap-2 align-items-center">
<span class="nt-section-label mb-0 me-1">Jump to</span>
<a href="#resource-record" class="badge text-decoration-none fw-normal"
style="background:var(--nt-surface-2,#1f2d42);color:var(--nt-primary-lt);border:1px solid var(--nt-border);font-size:.78rem;padding:.3em .65em">
Resource Record</a>
<a href="#owner" class="badge text-decoration-none fw-normal"
style="background:var(--nt-surface-2,#1f2d42);color:var(--nt-primary-lt);border:1px solid var(--nt-border);font-size:.78rem;padding:.3em .65em">
Owner</a>
<a href="#label" class="badge text-decoration-none fw-normal"
style="background:var(--nt-surface-2,#1f2d42);color:var(--nt-primary-lt);border:1px solid var(--nt-border);font-size:.78rem;padding:.3em .65em">
Label</a>
<a href="#ttl" class="badge text-decoration-none fw-normal"
style="background:var(--nt-surface-2,#1f2d42);color:var(--nt-primary-lt);border:1px solid var(--nt-border);font-size:.78rem;padding:.3em .65em">
TTL</a>
<a href="#class" class="badge text-decoration-none fw-normal"
style="background:var(--nt-surface-2,#1f2d42);color:var(--nt-primary-lt);border:1px solid var(--nt-border);font-size:.78rem;padding:.3em .65em">
Class</a>
<a href="#type" class="badge text-decoration-none fw-normal"
style="background:var(--nt-surface-2,#1f2d42);color:var(--nt-primary-lt);border:1px solid var(--nt-border);font-size:.78rem;padding:.3em .65em">
Type</a>
<a href="#rdata" class="badge text-decoration-none fw-normal"
style="background:var(--nt-surface-2,#1f2d42);color:var(--nt-primary-lt);border:1px solid var(--nt-border);font-size:.78rem;padding:.3em .65em">
Rdata</a>
<a href="#domain" class="badge text-decoration-none fw-normal"
style="background:var(--nt-surface-2,#1f2d42);color:var(--nt-primary-lt);border:1px solid var(--nt-border);font-size:.78rem;padding:.3em .65em">
Domain</a>
<a href="#node" class="badge text-decoration-none fw-normal"
style="background:var(--nt-surface-2,#1f2d42);color:var(--nt-primary-lt);border:1px solid var(--nt-border);font-size:.78rem;padding:.3em .65em">
Node</a>
<a href="#domain-name" class="badge text-decoration-none fw-normal"
style="background:var(--nt-surface-2,#1f2d42);color:var(--nt-primary-lt);border:1px solid var(--nt-border);font-size:.78rem;padding:.3em .65em">
Domain Name</a>
</div>
</div>
<!-- Terms -->
<dl>
<div class="nt-term" id="resource-record">
<dt>Resource Record <span style="font-size:.72rem;font-weight:400;color:var(--nt-muted)">(RR)</span></dt>
<dd>Structured data associated with a name or node in the DNS tree.</dd>
<dd class="nt-sub">Format: <code>owner ttl class type rdata</code></dd>
<dd class="nt-sub">Example: <code>www.example.com. 3600 IN A 192.0.2.127</code></dd>
</div>
<div class="nt-term" id="owner">
<dt>Owner <span style="font-size:.72rem;font-weight:400;color:var(--nt-muted)">/ name</span></dt>
<dd>A node in the domain name tree. For a specific RR, <em>owner</em> is the domain name where the RR is found. <span style="color:var(--nt-muted);font-size:.84rem">(RFC 1034 §3.6)</span></dd>
<dd class="nt-sub">Consists of a sequence of labels.</dd>
<dd class="nt-sub">Format: <code>node.zone.tld.</code> — the rightmost label is null (the root); the second-from-right is the TLD; the third-from-right is typically the organizational domain.</dd>
</div>
<div class="nt-term" id="label">
<dt>Label</dt>
<dd>A character string between the dots in a domain name.</dd>
<dd class="nt-sub">Example: in <code>www.example.com.</code> the labels are <code>www</code>, <code>example</code>, and <code>com</code>.</dd>
</div>
<div class="nt-term" id="ttl">
<dt>TTL <span style="font-size:.72rem;font-weight:400;color:var(--nt-muted)">time to live</span></dt>
<dd>How long, in seconds, resolvers are permitted to cache this DNS resource record.</dd>
</div>
<div class="nt-term" id="class">
<dt>Class</dt>
<dd>Identifies the protocol family of the record. The internet class <code>IN</code> is used for virtually all modern DNS records.</dd>
<dd class="nt-sub">Other values: <code>CH</code> (Chaosnet), <code>HS</code> (Hesiod).</dd>
</div>
<div class="nt-term" id="type">
<dt>Type</dt>
<dd>Specifies the kind of rdata that follows in the record.</dd>
<dd class="nt-sub">Examples: <code>A</code>, <code>AAAA</code>, <code>MX</code>, <code>SOA</code>, <code>NS</code>, <code>CNAME</code>, <code>PTR</code>, <code>TXT</code>.</dd>
</div>
<div class="nt-term" id="rdata">
<dt>Rdata <span style="font-size:.72rem;font-weight:400;color:var(--nt-muted)">resource data</span></dt>
<dd>The payload of the resource record. Contents vary widely by record type.</dd>
<dd class="nt-sub"><code>A</code> records carry an IPv4 address; <code>AAAA</code> records carry an IPv6 address; <code>MX</code> records carry a mail exchange hostname; <code>CNAME</code> records carry a canonical name target.</dd>
</div>
<div class="nt-term" id="domain">
<dt>Domain</dt>
<dd>An administrative boundary within the domain name tree.</dd>
</div>
<div class="nt-term" id="subdomain">
<dt>Subdomain</dt>
<dd>A domain contained within another domain.</dd>
<dd class="nt-sub">Example: <code>c.b.a.</code> is a subdomain of <code>b.a.</code></dd>
</div>
<div class="nt-term" id="node">
<dt>Node</dt>
<dd>A leaf or interior point in the domain name tree. <span style="color:var(--nt-muted);font-size:.84rem">(RFC 1034 §3.1)</span></dd>
</div>
<div class="nt-term" id="domain-name">
<dt>Domain Name</dt>
<dd>The list of labels from a node up to the root of the tree. A domain name uniquely identifies a node. <span style="color:var(--nt-muted);font-size:.84rem">(RFC 1035 §3.6)</span></dd>
</div>
</dl>
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