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    <title>IPv6 Address Formats </title>
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<a name="wp1072957"> </a><h1 class="pTitle">
IPv6 Address Formats

</h1>
<a name="wp1072958"> </a><p class="pBody">
IPv6 addresses are represented as a series of 16-bit hexadecimal fields separated by colons (:) in the 
format x:x:x:x:x:x:x:x. The following are examples of IPv6 addresses:

</p>
<a name="wp1072959"> </a><p class="pListBodyLevel1">
2001:0DB8:7654:3210:FEDC:BA98:7654:3210

</p>
<a name="wp1072960"> </a><p class="pListBodyLevel1">
2001:0DB8:0:0:8:800:200C:417A

</p>
<a name="wp1072961"> </a><p class="pBody">
It is common for IPv6 addresses to contain successive hexadecimal fields of zeros. To make IPv6 
addresses easier to use, two colons (::) may be used to compress successive hexadecimal fields of zeros 
at the beginning, middle, or end of an IPv6 address (the colons represent successive hexadecimal fields 
of zeros). <a href="ipv604.html#wp1072973">Table&#160;8-1</a> lists compressed IPv6 address formats.

</p>
<a name="wp1072965"> </a><p class="pBodyAutonumNoRule">
<strong>Note	&nbsp;&nbsp;&nbsp;</strong> Two colons (::) can be used only once in an IPv6 address to represent the longest successive hexadecimal 
fields of zeros.

</p>
<a name="wp1072966"> </a><p class="pBodyAutonumNoRule">
<strong>Note	&nbsp;&nbsp;&nbsp;</strong> The hexadecimal letters in IPv6 addresses are not case-sensitive.

</p>
<a name="wp1072996"> </a><p class="pBodyRelative">
</p><div>
<table border="2" cellpadding="2" id="wp1072973table1072967">
  <caption><a name="wp1072973"> </a><div class="pTableTitle">
Table&#160;8-1	Compressed IPv6 Address Formats&#160;

</div>
</caption>
  <tr bgcolor="#CCCCCC" align="left" valign="middle">    <th><a name="wp1072979"> </a><p class="pCellHeading">
IPv6 Address Type

</p>
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    <th><a name="wp1072981"> </a><p class="pCellHeading">
 Uncompressed Format

</p>
</th>
    <th><a name="wp1072983"> </a><p class="pCellHeading">
Compressed Format

</p>
</th>
</tr>
  <tr align="left" valign="top">    <td><a name="wp1072985"> </a><p class="pBody">
Unicast

</p>
</td>
    <td><a name="wp1072987"> </a><p class="pBody">
2001:0DB8:800:200C:0:0:0:417A

</p>
</td>
    <td><a name="wp1072989"> </a><p class="pBody">
2001:0DB8:800:200C::417A

</p>
</td>
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  <tr align="left" valign="top">    <td><a name="wp1072991"> </a><p class="pBody">
Multicast

</p>
</td>
    <td><a name="wp1072993"> </a><p class="pBody">
FF01:0:0:0:0:0:0:101

</p>
</td>
    <td><a name="wp1072995"> </a><p class="pBody">
FF01::101

</p>
</td>
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</table>
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</p>
<hr /><br><p class="pBody">Copyright 2010-2013, Cisco Systems, Inc. All rights reserved.</p> 

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