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<!DOCTYPE HTML>
<html>
<head>
<title>Unique Local IPv6 Generator</title>
<meta charset="utf-8">
<link rel="icon" href="/favicon.ico" type="image/x-icon">
<link rel="stylesheet" href="/libraries/bootstrap/3.0.3/bootstrap.min.css">
<link rel="stylesheet" href="/css/styles.css">
</head>
<body>
<div class="container">
<div class="header">
<ul class="nav nav-pills pull-right">
<li class="active"><a href="/">Generator</a></li>
<li><a href="faq.html">Unique-Local</a></li>
<li><a href="about.html">IPv6 Basics</a></li>
</ul>
<h3 class="text-muted">Unique Local IPv6 Generator</h3>
</div>
<div>
<h2>IPv6 Address Basics</h2>
<p>
This short article aims to give a compact overview over the structure
of IPv6 addresses.
</p>
<br>
<h4>Address length</h4>
<p>
The IPv6 address is 128 bits or 16 bytes long and is written in 8
hexadecimal blocks separated by colons. Each block consists of 16
bits or 2 bytes.
</p>
<p>
Because IPv6 addresses get quite long there are two rules to shorten
the address:
</p>
<ol>
<li>Leading zeroes can be omitted in each block</li>
<li>Multiple blocks of zeroes can be omitted once</li>
</ol>
<br>
<h4>Leading zeroes</h4>
<p>
When you write an IPv6 address, you can omit leading zeroes (the ones
on the left) in each block:
</p>
<pre>
IPv6 address with leading zeroes
2001:1620:0028:0001:0b6f:8bca:0093:a116
^^ ^^^ ^ ^^
Leading zeroes removed
2001:1620:28:1:b6f:8bca:93:a116
</pre>
<br>
<h4>Blocks of zeroes</h4>
<p>
If one block or multiple joining blocks consist of only zeroes. They
can be omitted and written as two colons. Watch out, this may only be
done only once per address.
</p>
<pre>
Complete IPv6 address
2001:1620:0028:0000:0000:0000:0000:0116
^^^^ ^^^^ ^^^^ ^^^^
Blocks of zeroes omitted
2001:1620:0028::0116
^^ ^
Without leading zeroes
2001:1620:28::116
</pre>
<br>
</div>
<div class="footer">
<p class="pull-right">© 2013 unique-local-ipv6.com</p>
</div>
</div> <!-- /container -->
<script src="/libraries/jquery/1.10.2/jquery.min.js"></script>
<script src="/libraries/bootstrap/3.0.3/bootstrap.min.js"></script>
</body>
</html>