<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/8c0fe6cc-9ad4-4675-9bd7-948dd7f5d449/4ABD781D-D1B3-4197-A1B7-02A02DD4E8CF/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.japan9.com/cgi/subnetmask.cgi" href="http://www.japan9.com/cgi/subnetmask.cgi" style="font-size: 11px;">www.japan9.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.japan9.com/cgi/subnetmask.cgi"><table background="undefined" bgcolor=""><tr><TD valign="top"><TABLE cellspacing="1" cellpadding="1" border="1"><TBODY><TR><TH>IPアドレス数</TH><TH>サブネットマスク</TH><TH>ビットマスク</TH></TR><TR><TD align="right">1</TD><TD align="right">255.255.255.255</TD><TD align="right">32</TD></TR><TR><TD align="right">2</TD><TD align="right">255.255.255.254</TD><TD align="right">31</TD></TR><TR><TD align="right">4</TD><TD align="right">255.255.255.252</TD><TD align="right">30</TD></TR><TR><TD align="right">8</TD><TD align="right">255.255.255.248</TD><TD align="right">29</TD></TR><TR><TD align="right">16</TD><TD align="right">255.255.255.240</TD><TD align="right">28</TD></TR><TR><TD align="right">32</TD><TD align="right">255.255.255.224</TD><TD align="right">27</TD></TR><TR><TD align="right">64</TD><TD align="right">255.255.255.192</TD><TD align="right">26</TD></TR><TR><TD align="right">128</TD><TD align="right">255.255.255.128</TD><TD align="right">25</TD></TR><TR><TD align="right">256</TD><TD align="right">255.255.255.0</TD><TD align="right">24</TD></TR><TR><TD align="right">512</TD><TD align="right">255.255.254.0</TD><TD align="right">23</TD></TR><TR><TD align="right">1,024</TD><TD align="right">255.255.252.0</TD><TD align="right">22</TD></TR><TR><TD align="right">2,048</TD><TD align="right">255.255.248.0</TD><TD align="right">21</TD></TR><TR><TD align="right">4,096</TD><TD align="right">255.255.240.0</TD><TD align="right">20</TD></TR><TR><TD align="right">8,192</TD><TD align="right">255.255.224.0</TD><TD align="right">19</TD></TR><TR><TD align="right">16,384</TD><TD align="right">255.255.192.0</TD><TD align="right">18</TD></TR><TR><TD align="right">32,768</TD><TD align="right">255.255.128.0</TD><TD align="right">17</TD></TR><TR><TD align="right">65,536</TD><TD align="right">255.255.0.0</TD><TD align="right">16</TD></TR><TR><TD align="right">131,072</TD><TD align="right">255.254.0.0</TD><TD align="right">15</TD></TR><TR><TD align="right">262,144</TD><TD align="right">255.252.0.0</TD><TD align="right">14</TD></TR><TR><TD align="right">524,288</TD><TD align="right">255.248.0.0</TD><TD align="right">13</TD></TR><TR><TD align="right">1,048,576</TD><TD align="right">255.240.0.0</TD><TD align="right">12</TD></TR><TR><TD align="right">2,097,152</TD><TD align="right">255.224.0.0</TD><TD align="right">11</TD></TR><TR><TD align="right">4,194,304</TD><TD align="right">255.192.0.0</TD><TD align="right">10</TD></TR><TR><TD align="right">8,388,608</TD><TD align="right">255.128.0.0</TD><TD align="right">9</TD></TR><TR><TD align="right">16,777,216</TD><TD align="right">255.0.0.0</TD><TD align="right">8</TD></TR><TR><TD align="right">33,554,432</TD><TD align="right">254.0.0.0</TD><TD align="right">7</TD></TR><TR><TD align="right">67,108,864</TD><TD align="right">252.0.0.0</TD><TD align="right">6</TD></TR><TR><TD align="right">134,217,728</TD><TD align="right">248.0.0.0</TD><TD align="right">5</TD></TR><TR><TD align="right">268,435,456</TD><TD align="right">240.0.0.0</TD><TD align="right">4</TD></TR><TR><TD align="right">536,870,912</TD><TD align="right">224.0.0.0</TD><TD align="right">3</TD></TR><TR><TD align="right">1,073,741,824</TD><TD align="right">192.0.0.0</TD><TD align="right">2</TD></TR><TR><TD align="right">2,147,483,648</TD><TD align="right">128.0.0.0</TD><TD align="right">1</TD></TR><TR><TD align="right">4,294,967,296</TD><TD align="right">0.0.0.0</TD><TD align="right">0</TD></TR></TBODY></TABLE></TD></tr></table></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/4ABD781D-D1B3-4197-A1B7-02A02DD4E8CF/blog/" title="blog or email this clip"><img src="http://content9.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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