Here’s the English translation:
<div><p>The design and management of networks are fundamental in an interconnected world. Understanding <a href="https://administraciondesistemas.com/guia-completa-subnetting-notacion-cidr/" target="_blank" rel="noopener">subnets and CIDR (Classless Inter-Domain Routing)</a> allows engineers to optimize resources and ensure efficient communication between devices. This comprehensive guide includes reference tables and detailed explanations to facilitate the understanding of these essential tools.</p><hr class="wp-block-separator has-alpha-channel-opacity"/><h3 class="wp-block-heading"><strong>CIDR Reference Table and Subnet Masks</strong></h3><figure class="wp-block-table"><table class="has-fixed-layout"><thead><tr><th><strong>CIDR</strong></th><th><strong>Subnet Mask</strong></th><th><strong>Wildcard Mask</strong></th><th><strong># of IP Addresses</strong></th><th><strong># of Usable IP Addresses</strong></th></tr></thead><tbody><tr><td>/32</td><td>255.255.255.255</td><td>0.0.0.0</td><td>1</td><td>1</td></tr><tr><td>/31</td><td>255.255.255.254</td><td>0.0.0.1</td><td>2</td><td>2*</td></tr><tr><td>/30</td><td>255.255.255.252</td><td>0.0.0.3</td><td>4</td><td>2</td></tr><tr><td>/29</td><td>255.255.255.248</td><td>0.0.0.7</td><td>8</td><td>6</td></tr><tr><td>/28</td><td>255.255.255.240</td><td>0.0.0.15</td><td>16</td><td>14</td></tr><tr><td>/27</td><td>255.255.255.224</td><td>0.0.0.31</td><td>32</td><td>30</td></tr><tr><td>/26</td><td>255.255.255.192</td><td>0.0.0.63</td><td>64</td><td>62</td></tr><tr><td>/25</td><td>255.255.255.128</td><td>0.0.0.127</td><td>128</td><td>126</td></tr><tr><td>/24</td><td>255.255.255.0</td><td>0.0.0.255</td><td>256</td><td>254</td></tr><tr><td>/23</td><td>255.255.254.0</td><td>0.0.1.255</td><td>512</td><td>510</td></tr><tr><td>/22</td><td>255.255.252.0</td><td>0.0.3.255</td><td>1,024</td><td>1,022</td></tr><tr><td>/21</td><td>255.255.248.0</td><td>0.0.7.255</td><td>2,048</td><td>2,046</td></tr><tr><td>/20</td><td>255.255.240.0</td><td>0.0.15.255</td><td>4,096</td><td>4,094</td></tr><tr><td>/19</td><td>255.255.224.0</td><td>0.0.31.255</td><td>8,192</td><td>8,190</td></tr><tr><td>/18</td><td>255.255.192.0</td><td>0.0.63.255</td><td>16,384</td><td>16,382</td></tr><tr><td>/17</td><td>255.255.128.0</td><td>0.0.127.255</td><td>32,768</td><td>32,766</td></tr><tr><td>/16</td><td>255.255.0.0</td><td>0.0.255.255</td><td>65,536</td><td>65,534</td></tr><tr><td>/15</td><td>255.254.0.0</td><td>0.1.255.255</td><td>131,072</td><td>131,070</td></tr><tr><td>/14</td><td>255.252.0.0</td><td>0.3.255.255</td><td>262,144</td><td>262,142</td></tr><tr><td>/13</td><td>255.248.0.0</td><td>0.7.255.255</td><td>524,288</td><td>524,286</td></tr><tr><td>/12</td><td>255.240.0.0</td><td>0.15.255.255</td><td>1,048,576</td><td>1,048,574</td></tr><tr><td>/11</td><td>255.224.0.0</td><td>0.31.255.255</td><td>2,097,152</td><td>2,097,150</td></tr><tr><td>/10</td><td>255.192.0.0</td><td>0.63.255.255</td><td>4,194,304</td><td>4,194,302</td></tr><tr><td>/9</td><td>255.128.0.0</td><td>0.127.255.255</td><td>8,388,608</td><td>8,388,606</td></tr><tr><td>/8</td><td>255.0.0.0</td><td>0.255.255.255</td><td>16,777,216</td><td>16,777,214</td></tr></tbody></table></figure><p>(*Note: /31 is a special case used in point-to-point links, according to RFC 3021).</p><hr class="wp-block-separator has-alpha-channel-opacity"/><h3 class="wp-block-heading"><strong>Subnet Masks and Wildcards: Decimal to Binary</strong></h3><figure class="wp-block-table"><table class="has-fixed-layout"><thead><tr><th><strong>Subnet Mask</strong></th><th><strong>Wildcard</strong></th></tr></thead><tbody><tr><td>255.255.255.255</td><td>0.0.0.0</td></tr><tr><td>255.255.255.254</td><td>0.0.0.1</td></tr><tr><td>255.255.255.252</td><td>0.0.0.3</td></tr><tr><td>255.255.255.248</td><td>0.0.0.7</td></tr><tr><td>255.255.255.240</td><td>0.0.0.15</td></tr><tr><td>255.255.255.224</td><td>0.0.0.31</td></tr><tr><td>255.255.255.192</td><td>0.0.0.63</td></tr></tbody></table></figure><hr class="wp-block-separator has-alpha-channel-opacity"/><h3 class="wp-block-heading"><strong>What is Subnetting and CIDR Notation?</strong></h3><p><strong>Subnetting</strong>: It is the process of dividing an IP network into smaller subnets, allowing for a more efficient use of available addresses and improved traffic management.</p><p><strong>CIDR (Classless Inter-Domain Routing)</strong>: Introduced in 1993, CIDR eliminated the rigid class-addressing system, allowing for variable-sized subnets and optimizing the use of IP addresses.</p><hr class="wp-block-separator has-alpha-channel-opacity"/><h3 class="wp-block-heading"><strong>Conclusion</strong></h3><p>Understanding subnet masks and CIDR notation is essential for networking professionals. These tools enable more efficient and scalable management in technology environments that demand greater connectivity and precision in resource usage.</p></div>