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<html> <head> <title>TheWorldsEnd.Net - Cisco Netmasks, CIDR sizes, and Inverse Masks</title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> </head> <body bgcolor="#000000" text="#FFFFFF"> <table width="857" height="146" border="0"> <tr> <td width="333" height="88"><a href="index.php"><img src="http://www.theworldsend.net/movie2.gif" width="220" height="50" usemap="#Movie2" border="0" alt="TheWorldsEnd.NET Logo"></a></td> <td width="68"><a href="http://www.freeiPods.com/?r=9089111"><img src="images/ipod.gif" width="50" height="86" border="0"> </a></td> <td width="84"><a href="http://www.freeiPods.com/?r=9089111">Free IPOD click here</a></td> <td width="127"><font size="2" face="Geneva, Arial, Helvetica, sans-serif"><em>Sign up 5 people for trials to other stuff and get a free Ipod or Mac</em></font></td> <td width="100"><a href="http://www.FreeMiniMacs.com/?r=14084600"><img src="images/minimac.jpg" width="100" height="58" border="0"></a></td> <td width="119"><a href="http://www.FreeMiniMacs.com/?r=14084600">Free Mini-MAC, click here</a></td> </tr> <tr> <td height="52" colspan="6"><font size="2" face="Arial, Helvetica, sans-serif"> To support this website and to get a free mini-mac or ipod, click on the ipod or mini mac above. (This really works, my co-worker received his ipod a week before X-mas). Sign up for something like Blockbusters, get some movies and cancel after a month, no risks and you help me and yourself.</font></td> </tr> </table> <hr width="580" align="left"> <pre>Cisco Netmasks, CIDR sizes, and Inverse Masks Below is a translation table of netmask to inverse to CIDR. <TABLE border="1"> <TR><TH width="164">Netmask</TH><TH width="161">Inverse</TH><TH width="56">/CIDR</TH><TH width="145">Usable</TH><TH width="146">Size</TH></TR> <TR><TD width="164">0.0.0.0</TD><TD width="161">255.255.255.255</TD><TD width="56">/0</TD><TD width="145">4,294,967,294</TD><TD width="146">The Internet</TD></TR> <TR><TD width="164">128.0.0.0</TD><TD width="161">127.255.255.255</TD><TD width="56">/1</TD><TD width="145">2,147,483,646</TD><TD width="146">128 Class 'A's</TD></TR> <TR><TD width="164">192.0.0.0</TD><TD width="161">63.255.255.255</TD><TD width="56">/2</TD><TD width="145">1,073,741,822</TD><TD width="146">64 Class 'A's</TD></TR> <TR><TD width="164">224.0.0.0</TD><TD width="161">31.255.255.255</TD><TD width="56">/3</TD><TD width="145">536,870,910</TD><TD width="146">32 Class 'A's</TD></TR> <TR><TD width="164">240.0.0.0</TD><TD width="161">15.255.255.255</TD><TD width="56">/4</TD><TD width="145">268,435,454</TD><TD width="146">16 Class 'A's</TD></TR> <TR><TD width="164">248.0.0.0</TD><TD width="161">7.255.255.255</TD><TD width="56">/5</TD><TD width="145">134,217,726</TD><TD width="146">8 Class 'A's</TD></TR> <TR><TD width="164">252.0.0.0</TD><TD width="161">3.255.255.255</TD><TD width="56">/6</TD><TD width="145">67,108,862</TD><TD width="146">4 Class 'A's</TD></TR> <TR><TD width="164">254.0.0.0</TD><TD width="161">1.255.255.255</TD><TD width="56">/7</TD><TD width="145">33,554,430</TD><TD width="146">2 Class 'A's</TD></TR> <TR><TD width="164">255.0.0.0</TD><TD width="161">0.255.255.255</TD><TD width="56">/8</TD><TD width="145">16,777,214</TD><TD width="146">1 Class 'A'</TD></TR> <TR><TD width="164">255.128.0.0</TD><TD width="161">0.127.255.255</TD><TD width="56">/9</TD><TD width="145">8,388,606</TD><TD width="146">128 Class 'B's</TD></TR> <TR><TD width="164">255.192.0.0</TD><TD width="161">0.63.255.255</TD><TD width="56">/10</TD><TD width="145">4,194,302</TD><TD width="146">64 Class 'B's</TD></TR> <TR><TD width="164">255.224.0.0</TD><TD width="161">0.31.255.255</TD><TD width="56">/11</TD><TD width="145">2,097,150</TD><TD width="146">32 Class 'B's</TD></TR> <TR><TD width="164">255.240.0.0</TD><TD width="161">0.15.255.255</TD><TD width="56">/12</TD><TD width="145">1,048,574</TD><TD width="146">16 Class 'B's</TD></TR> <TR><TD width="164">255.248.0.0</TD><TD width="161">0.7.255.255</TD><TD width="56">/13</TD><TD width="145">524,286</TD><TD width="146">8 Class 'B's</TD></TR> <TR><TD width="164">255.252.0.0</TD><TD width="161">0.3.255.255</TD><TD width="56">/14</TD><TD width="145">262,142</TD><TD width="146">4 Class 'B's</TD></TR> <TR><TD width="164">255.254.0.0</TD><TD width="161">0.1.255.255</TD><TD width="56">/15</TD><TD width="145">131,070</TD><TD width="146">2 Class 'B's</TD></TR> <TR><TD width="164">255.255.0.0</TD><TD width="161">0.0.255.255</TD><TD width="56">/16</TD><TD width="145">65,534</TD><TD width="146">1 Class 'B'</TD></TR> <TR><TD width="164">255.255.128.0</TD><TD width="161">0.0.127.255</TD><TD width="56">/17</TD><TD width="145">32,766</TD><TD width="146">128 Class 'C's</TD></TR> <TR><TD width="164">255.255.192.0</TD><TD width="161">0.0.63.255</TD><TD width="56">/18</TD><TD width="145">16,382</TD><TD width="146">64 Class 'C's</TD></TR> <TR><TD width="164">255.255.224.0</TD><TD width="161">0.0.31.255</TD><TD width="56">/19</TD><TD width="145">8,190</TD><TD width="146">32 Class 'C's</TD></TR> <TR><TD width="164">255.255.240.0</TD><TD width="161">0.0.15.255</TD><TD width="56">/20</TD><TD width="145">4,094</TD><TD width="146">16 Class 'C's</TD></TR> <TR><TD width="164">255.255.248.0</TD><TD width="161">0.0.7.255</TD><TD width="56">/21</TD><TD width="145">2,046</TD><TD width="146">8 Class 'C's</TD></TR> <TR><TD width="164">255.255.252.0</TD><TD width="161">0.0.3.255</TD><TD width="56">/22</TD><TD width="145">1,022</TD><TD width="146">4 Class 'C's</TD></TR> <TR><TD width="164">255.255.254.0</TD><TD width="161">0.0.1.255</TD><TD width="56">/23</TD><TD width="145">510</TD><TD width="146">2 Class 'C's</TD></TR> <TR><TD width="164">255.255.255.0</TD><TD width="161">0.0.0.255</TD><TD width="56">/24</TD><TD width="145">254</TD><TD width="146">1 Class 'C'</TD></TR> <TR><TD width="164">255.255.255.128</TD><TD width="161">0.0.0.127</TD><TD width="56">/25</TD><TD width="145">126</TD><TD width="146">128 Hosts</TD></TR> <TR><TD width="164">255.255.255.192</TD><TD width="161">0.0.0.63</TD><TD width="56">/26</TD><TD width="145">62</TD><TD width="146">64 Hosts</TD></TR> <TR><TD width="164">255.255.255.224</TD><TD width="161">0.0.0.31</TD><TD width="56">/27</TD><TD width="145">30</TD><TD width="146">32 Hosts</TD></TR> <TR><TD width="164">255.255.255.240</TD><TD width="161">0.0.0.15</TD><TD width="56">/28</TD><TD width="145">14</TD><TD width="146">16 Hosts</TD></TR> <TR><TD width="164">255.255.255.248</TD><TD width="161">0.0.0.7</TD><TD width="56">/29</TD><TD width="145">6</TD><TD width="146">8 Hosts</TD></TR> <TR><TD width="164">255.255.255.252</TD><TD width="161">0.0.0.3</TD><TD width="56">/30</TD><TD width="145">2</TD><TD width="146">4 Hosts</TD></TR> <TR><TD width="164">255.255.255.254</TD><TD width="161">0.0.0.1</TD><TD width="56">/31</TD><TD width="145">0</TD><TD width="146">2 Hosts</TD></TR> <TR><TD width="164">255.255.255.255</TD><TD width="161">0.0.0.0</TD><TD width="56">/32</TD><TD width="145">1</TD><TD width="146">1 Host</TD></TR> </TABLE> </pre> <center> <font size=1 color="#999999"> <a href="/copyright.php"><span class="yelloheader">Copyright</span></a> © 2000, 2001 • TheWorldsEnd.NET (You may cite this site at will. 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