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	Copyright © 2015-2016 Alex Yst <mailto:copyright@y.st>

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<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
	<head>
		<base href="https://y.st./en/URI_research/special-use_domains.xhtml" />
		<title>Special-Use Domain Names &lt;https://y.st./en/URI_research/special-use_domains.xhtml&gt;</title>
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		<header>
			<h1>Special-Use Domain Names</h1>
			<p>Domain names reserved by <abbr title="Internet Assigned Numbers Authority">IANA</abbr> for special uses</p>
		</header>
<p>For an in-depth explanation of what each special-use domain name is used for, I recommend checking out the <a href="https://www.iana.org/assignments/special-use-domain-names/special-use-domain-names.xhtml">special-use domain names</a> page on the <abbr title="Internet Assigned Numbers Authority">IANA</abbr> website. This page simply breaks the list of special-use domain names into four broad groups based on characteristics that they have.</p>

<h2>Name server names</h2>
<p>These names are available for use with your own intranet&apos;s name server.</p>
<ul>
	<li>10.in-addr.arpa.</li>
	<li>16.172.in-addr.arpa.</li>
	<li>17.172.in-addr.arpa.</li>
	<li>18.172.in-addr.arpa.</li>
	<li>19.172.in-addr.arpa.</li>
	<li>20.172.in-addr.arpa.</li>
	<li>21.172.in-addr.arpa.</li>
	<li>22.172.in-addr.arpa.</li>
	<li>23.172.in-addr.arpa.</li>
	<li>24.172.in-addr.arpa.</li>
	<li>25.172.in-addr.arpa.</li>
	<li>26.172.in-addr.arpa.</li>
	<li>27.172.in-addr.arpa.</li>
	<li>28.172.in-addr.arpa.</li>
	<li>29.172.in-addr.arpa.</li>
	<li>30.172.in-addr.arpa.</li>
	<li>31.172.in-addr.arpa.</li>
	<li>168.192.in-addr.arpa.</li>
	<li>test.</li>
</ul>

<h2>Dynamic names</h2>
<p>These names are handled dynamically by software and should not be used with a name server.</p>
<ul>
	<li>254.169.in-addr.arpa.</li>
	<li>8.e.f.ip6.arpa.</li>
	<li>9.e.f.ip6.arpa.</li>
	<li>a.e.f.ip6.arpa.</li>
	<li>b.e.f.ip6.arpa.</li>
	<li>onion.</li>
	<li>local.</li>
</ul>

<h2>Static names</h2>
<p>These names are assigned their values based on standards and should not be used with a name server.</p>
<ul>
	<li>invalid.</li>
	<li>localhost.</li>
</ul>

<h2>Unspecial names</h2>
<p>These names are considered special by <abbr title="Internet Assigned Numbers Authority">IANA</abbr>, but they are not supposed to actually be treated as special in any way.</p>
<ul>
	<li>example.</li>
	<li>example.com.</li>
	<li>example.net.</li>
	<li>example.org.</li>
</ul>
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		<p>
			Copyright © 2015-2016 Alex Yst;
			You may modify and/or redistribute this document under the terms of the <a rel="license" href="/license/gpl-3.0-standalone.xhtml"><abbr title="GNU&apos;s Not Unix">GNU</abbr> <abbr title="General Public License version Three or later">GPLv3+</abbr></a>.
			If for some reason you would prefer to modify and/or distribute this document under other free copyleft terms, please ask me via email.
			My address is in the source comments near the top of this document.
			This license also applies to embedded content such as images.
			For more information on that, see <a href="/en/a/licensing.xhtml">licensing</a>.
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			<abbr title="World Wide Web Consortium">W3C</abbr> standards are important.
			This document conforms to the <a href="https://validator.w3.org./nu/?doc=https%3A%2F%2Fy.st.%2Fen%2FURI_research%2Fspecial-use_domains.xhtml"><abbr title="Extensible Hypertext Markup Language">XHTML</abbr> 5.1</a> specification and uses style sheets that conform to the <a href="http://jigsaw.w3.org./css-validator/validator?uri=https%3A%2F%2Fy.st.%2Fen%2FURI_research%2Fspecial-use_domains.xhtml"><abbr title="Cascading Style Sheets">CSS</abbr>3</a> specification.
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