https://www.dukehsu.com/tags/ipv4%E5%AD%90%E7%BD%91%E6%9F%A5%E8%AF%A2.htmlRecent content in Ipv4子网查询 on Duke Hsu ｜ Learn • Build • Sharehttps://www.dukehsu.com/images/og-default.jpghttps://www.dukehsu.com/images/og-default.jpgHugoen-USWed, 21 Jul 2021 00:00:00 +0000https://www.dukehsu.com/posts/ipv4subnets.htmlWed, 21 Jul 2021 00:00:00 +0000https://www.dukehsu.com/posts/ipv4subnets.html<h3 id="子网-subnets">子网 Subnets</h3> <table> <thead> <tr> <th>CIDR</th> <th>子网掩码</th> <th>地址数</th> <th>通配符</th> </tr> </thead> <tbody> <tr> <td>/32</td> <td>255.255.255.255</td> <td>1</td> <td>0.0.0.0</td> </tr> <tr> <td>/31</td> <td>255.255.255.254</td> <td>2</td> <td>0.0.0.1</td> </tr> <tr> <td>/30</td> <td>255.255.255.252</td> <td>4</td> <td>0.0.0.3</td> </tr> <tr> <td>/29</td> <td>255.255.255.248</td> <td>8</td> <td>0.0.0.7</td> </tr> <tr> <td>/28</td> <td>255.255.255.240</td> <td>16</td> <td>0.0.0.15</td> </tr> <tr> <td>/27</td> <td>255.255.255.224</td> <td>32</td> <td>0.0.0.31</td> </tr> <tr> <td>/26</td> <td>255.255.255.192</td> <td>64</td> <td>0.0.0.63</td> </tr> <tr> <td>/25</td> <td>255.255.255.128</td> <td>128</td> <td>0.0.0.127</td> </tr> <tr> <td>/24</td> <td>255.255.255.0</td> <td>256</td> <td>0.0.0.255</td> </tr> <tr> <td>/23</td> <td>255.255.254.0</td> <td>512</td> <td>0.0.1.255</td> </tr> <tr> <td>/22</td> <td>255.255.252.0</td> <td>1,024</td> <td>0.0.3.255</td> </tr> <tr> <td>/21</td> <td>255.255.248.0</td> <td>2,048</td> <td>0.0.7.255</td> </tr> <tr> <td>/20</td> <td>255.255.240.0</td> <td>4,096</td> <td>0.0.15.255</td> </tr> <tr> <td>/19</td> <td>255.255.224.0</td> <td>8,192</td> <td>0.0.31.255</td> </tr> <tr> <td>/18</td> <td>255.255.192.0</td> <td>16,384</td> <td>0.0.63.255</td> </tr> <tr> <td>/17</td> <td>255.255.128.0</td> <td>32,768</td> <td>0.0.127.255</td> </tr> <tr> <td>/16</td> <td>255.255.0.0</td> <td>65,536</td> <td>0.0.255.255</td> </tr> <tr> <td>/15</td> <td>255.254.0.0</td> <td>131,072</td> <td>0.1.255.255</td> </tr> <tr> <td>/14</td> <td>255.252.0.0</td> <td>262,144</td> <td>0.3.255.255</td> </tr> <tr> <td>/13</td> <td>255.248.0.0</td> <td>524,288</td> <td>0.7.255.255</td> </tr> <tr> <td>/12</td> <td>255.240.0.0</td> <td>1,048,576</td> <td>0.15.255.255</td> </tr> <tr> <td>/11</td> <td>255.224.0.0</td> <td>2,097,152</td> <td>0.31.255.255</td> </tr> <tr> <td>/10</td> <td>255.192.0.0</td> <td>4,194,304</td> <td>0.63.255.255</td> </tr> <tr> <td>/9</td> <td>255.128.0.0</td> <td>8,388,608</td> <td>0.127.255.255</td> </tr> <tr> <td>/8</td> <td>255.0.0.0</td> <td>16,777,216</td> <td>0.255.255.255</td> </tr> <tr> <td>/7</td> <td>254.0.0.0</td> <td>33,554,432</td> <td>1.255.255.255</td> </tr> <tr> <td>/6</td> <td>252.0.0.0</td> <td>67,108,864</td> <td>3.255.255.255</td> </tr> <tr> <td>/5</td> <td>248.0.0.0</td> <td>134,217,728</td> <td>7.255.255.255</td> </tr> <tr> <td>/4</td> <td>240.0.0.0</td> <td>268,435,456</td> <td>15.255.255.255</td> </tr> <tr> <td>/3</td> <td>224.0.0.0</td> <td>536,870,912</td> <td>31.255.255.255</td> </tr> <tr> <td>/2</td> <td>192.0.0.0</td> <td>1,073,741,824</td> <td>63.255.255.255</td> </tr> <tr> <td>/1</td> <td>128.0.0.0</td> <td>2,147,483,648</td> <td>127.255.255.255</td> </tr> <tr> <td>/0</td> <td>0.0.0.0</td> <td>4,294,967,296</td> <td>255.255.255.255</td> </tr> </tbody> </table> <h3 id="ip-地址类-ip-address-classes">IP 地址类 IP Address Classes</h3> <table> <thead> <tr> <th>Class</th> <th>地址段</th> </tr> </thead> <tbody> <tr> <td>A</td> <td>0.0.0.0 - 127.255.255.255</td> </tr> <tr> <td>B</td> <td>128.0.0.0 - 191.255.255.255</td> </tr> <tr> <td>C</td> <td>192.0.0.0 - 223.255.255.255</td> </tr> <tr> <td>D</td> <td>224.0.0.0 - 239.255.255.255</td> </tr> <tr> <td>E</td> <td>240.0.0.0 - 255.255.255.255</td> </tr> </tbody> </table> <h3 id="保留私有地址段">保留（私有）地址段</h3> <table> <thead> <tr> <th>Class A</th> <th>10.0.0.0 - 10.255.255.255</th> </tr> </thead> <tbody> <tr> <td>Class B</td> <td>172.16.0.0 - 172.31.255.255</td> </tr> <tr> <td>Class C</td> <td>192.168.0.0 - 192.168.255.255</td> </tr> <tr> <td>localhost</td> <td>127.0.0.0 - 127.255.255.255</td> </tr> <tr> <td>zeroconf</td> <td>169.254.0.0 - 169.254.255.255</td> </tr> <tr> <td>内部路由 (<a href="https://tools.ietf.org/html/rfc6598">RFC 6598</a>)</td> <td>100.64.0.0 - 100.127.255.255</td> </tr> </tbody> </table> <h3 id="十进制到二进制对应表">十进制到二进制对应表</h3> <table> <thead> <tr> <th>十进制子网掩码</th> <th>对应二进制</th> <th>十进制通配符</th> <th>对应二进制</th> </tr> </thead> <tbody> <tr> <td>255</td> <td>1111 1111</td> <td>0</td> <td>0000 0000</td> </tr> <tr> <td>254</td> <td>1111 1110</td> <td>1</td> <td>0000 0001</td> </tr> <tr> <td>252</td> <td>1111 1100</td> <td>3</td> <td>0000 0011</td> </tr> <tr> <td>248</td> <td>1111 1000</td> <td>7</td> <td>0000 0111</td> </tr> <tr> <td>240</td> <td>1111 0000</td> <td>15</td> <td>0000 1111</td> </tr> <tr> <td>224</td> <td>1110 0000</td> <td>31</td> <td>0001 1111</td> </tr> <tr> <td>192</td> <td>1100 0000</td> <td>63</td> <td>0011 1111</td> </tr> <tr> <td>128</td> <td>1000 0000</td> <td>127</td> <td>0111 1111</td> </tr> <tr> <td>0</td> <td>0000 0000</td> <td>255</td> <td>1111 1111</td> </tr> </tbody> </table> <h3 id="术语表">术语表</h3> <table> <thead> <tr> <th>通配符掩码</th> <th>在用二进制表示的通配符掩码中，0 表示要检查的位，1 表示不需要检查的位。</th> </tr> </thead> <tbody> <tr> <td>CIDR</td> <td>Classless Inter Domain Routing 提供了比传统的 IP 地址类更细致的地址划分。CIDR 标记写法是 /XX</td> </tr> </tbody> </table>