{"id":19,"date":"2021-08-18T21:47:00","date_gmt":"2021-08-18T21:47:00","guid":{"rendered":"https:\/\/subnettingpractice.com\/?page_id=19"},"modified":"2021-09-06T04:30:52","modified_gmt":"2021-09-05T21:30:52","slug":"subnet-cheat-sheet","status":"publish","type":"page","link":"https:\/\/subnettingpractice.com\/subnet-cheat-sheet.html","title":{"rendered":"Subnet Cheat Sheet"},"content":{"rendered":"<picture><source srcset=\"https:\/\/subnettingpractice.com\/wp-content\/uploads\/Subnet-Cheat-Sheet-Form.avif 270w,https:\/\/subnettingpractice.com\/wp-content\/uploads\/Subnet-Cheat-Sheet-Form-169x300.avif 169w\" sizes=\"(max-width: 270px) 100vw, 270px\" type=\"image\/avif\"><source srcset=\"https:\/\/subnettingpractice.com\/wp-content\/uploads\/Subnet-Cheat-Sheet-Form.webp 270w,https:\/\/subnettingpractice.com\/wp-content\/uploads\/Subnet-Cheat-Sheet-Form-169x300.webp 169w\" sizes=\"(max-width: 270px) 100vw, 270px\" type=\"image\/webp\"><img src=\"https:\/\/subnettingpractice.com\/wp-content\/uploads\/Subnet-Cheat-Sheet-Form.jpg\" height=\"480\" width=\"270\" srcset=\"https:\/\/subnettingpractice.com\/wp-content\/uploads\/Subnet-Cheat-Sheet-Form.jpg 270w, https:\/\/subnettingpractice.com\/wp-content\/uploads\/Subnet-Cheat-Sheet-Form-169x300.jpg 169w\" sizes=\"(max-width: 270px) 100vw, 270px\" class=\"aligncenter size-full wp-image-638 sp-no-webp\" alt=\"Subnet Cheat Sheet\" loading=\"lazy\" decoding=\"async\"  > <\/picture>\r\n\r\n<h4>Download our complete Subnet Cheat Sheet PDF:<\/h4>\r\n<script async data-uid=\"ec2b65cc3d\" src=\"https:\/\/deft-knitter-9321.ck.page\/ec2b65cc3d\/index.js\" data-jetpack-boost=\"ignore\" data-no-defer=\"1\" nowprocket><\/script>\r\n<p class=\"ckform-disclaimer\">The PDF will be delivered to your email inbox. We won&#8217;t send you any spam. Unsubscribe at any time.<\/p>\r\n<p><\/p>\r\n\r\n<h2>IPv4 Subnet Cheat Sheet<\/h2>\r\n<table border=\"1\" cellspacing=\"1\" cellpadding=\"2\" bgcolor=\"#EEEEEE\">\r\n<thead>\r\n<tr>\r\n<td>\r\n<p align=\"center\"><strong>CIDR<\/strong><\/p>\r\n<\/td>\r\n<td>\r\n<p align=\"center\"><strong>Subnet Mask<\/strong><\/p>\r\n<\/td>\r\n<td>\r\n<p align=\"center\"><strong>Total IPs<\/strong><\/p>\r\n<\/td>\r\n<td>\r\n<p align=\"center\"><strong>Usable IPs<\/strong><\/p>\r\n<\/td>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td>\/32<\/td>\r\n<td>255.255.255.255<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/31<\/td>\r\n<td>255.255.255.254<\/td>\r\n<td>2<\/td>\r\n<td>2*<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/30<\/td>\r\n<td>255.255.255.252<\/td>\r\n<td>4<\/td>\r\n<td>2<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/29<\/td>\r\n<td>255.255.255.248<\/td>\r\n<td>8<\/td>\r\n<td>6<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/28<\/td>\r\n<td>255.255.255.240<\/td>\r\n<td>16<\/td>\r\n<td>14<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/27<\/td>\r\n<td>255.255.255.224<\/td>\r\n<td>32<\/td>\r\n<td>30<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/26<\/td>\r\n<td>255.255.255.192<\/td>\r\n<td>64<\/td>\r\n<td>62<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/25<\/td>\r\n<td>255.255.255.128<\/td>\r\n<td>128<\/td>\r\n<td>126<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/24<\/td>\r\n<td>255.255.255.0<\/td>\r\n<td>256<\/td>\r\n<td>254<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/23<\/td>\r\n<td>255.255.254.0<\/td>\r\n<td>512<\/td>\r\n<td>510<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/22<\/td>\r\n<td>255.255.252.0<\/td>\r\n<td>1024<\/td>\r\n<td>1022<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/21<\/td>\r\n<td>255.255.248.0<\/td>\r\n<td>2048<\/td>\r\n<td>2046<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/20<\/td>\r\n<td>255.255.240.0<\/td>\r\n<td>4096<\/td>\r\n<td>4094<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/19<\/td>\r\n<td>255.255.224.0<\/td>\r\n<td>8192<\/td>\r\n<td>8190<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/18<\/td>\r\n<td>255.255.192.0<\/td>\r\n<td>16,384<\/td>\r\n<td>16,382<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/17<\/td>\r\n<td>255.255.128.0<\/td>\r\n<td>32,768<\/td>\r\n<td>32,766<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/16<\/td>\r\n<td>255.255.0.0<\/td>\r\n<td>65,536<\/td>\r\n<td>65,534<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/15<\/td>\r\n<td>255.254.0.0<\/td>\r\n<td>131,072<\/td>\r\n<td>131,070<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/14<\/td>\r\n<td>255.252.0.0<\/td>\r\n<td>262,144<\/td>\r\n<td>262,142<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/13<\/td>\r\n<td>255.248.0.0<\/td>\r\n<td>524,288<\/td>\r\n<td>524,286<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/12<\/td>\r\n<td>255.240.0.0<\/td>\r\n<td>1,048,576<\/td>\r\n<td>1,048,574<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/11<\/td>\r\n<td>255.224.0.0<\/td>\r\n<td>2,097,152<\/td>\r\n<td>2,097,150<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/10<\/td>\r\n<td>255.192.0.0<\/td>\r\n<td>4,194,304<\/td>\r\n<td>4,194,302<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/9<\/td>\r\n<td>255.128.0.0<\/td>\r\n<td>8,388,608<\/td>\r\n<td>8,388,606<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/8<\/td>\r\n<td>255.0.0.0<\/td>\r\n<td>16,777,216<\/td>\r\n<td>16,777,214<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/7<\/td>\r\n<td>254.0.0.0<\/td>\r\n<td>33,554,432<\/td>\r\n<td>33,554,430<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/6<\/td>\r\n<td>252.0.0.0<\/td>\r\n<td>67,108,864<\/td>\r\n<td>67,108,862<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/5<\/td>\r\n<td>248.0.0.0<\/td>\r\n<td>134,217,728<\/td>\r\n<td>134,217,726<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/4<\/td>\r\n<td>240.0.0.0<\/td>\r\n<td>268,435,456<\/td>\r\n<td>268,435,454<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/3<\/td>\r\n<td>224.0.0.0<\/td>\r\n<td>536,870,912<\/td>\r\n<td>536,870,910<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/2<\/td>\r\n<td>192.0.0.0<\/td>\r\n<td>1,073,741,824<\/td>\r\n<td>1,073,741,822<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/1<\/td>\r\n<td>128.0.0.0<\/td>\r\n<td>2,147,483,648<\/td>\r\n<td>2,147,483,646<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n*See <a href=\"https:\/\/tools.ietf.org\/rfc\/rfc3021.txt\">rfc 3021<\/a>\r\n<h2>Private IP ranges<\/h2>\r\n<table border=\"1\" cellspacing=\"1\" cellpadding=\"2\" bgcolor=\"#EEEEEE\">\r\n<tbody>\r\n<tr>\r\n<td>Class<\/td>\r\n<td>Size<\/td>\r\n<td>Subnet Mask<\/td>\r\n<td>Range of IPs<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Class A<\/td>\r\n<td>10.0.0.0\/8<\/td>\r\n<td>255.0.0.0<\/td>\r\n<td>10.0.0.0 &#8211; 10.255.255.255<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Class B<\/td>\r\n<td>172.16.0.0\/12<\/td>\r\n<td>255.240.0.0<\/td>\r\n<td>172.16.0.0 &#8211; 172.31.255.255<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Class C<\/td>\r\n<td>192.168.0.0\/16<\/td>\r\n<td>255.255.0.0<\/td>\r\n<td>192.168.0.0 &#8211; 192.168.255.255<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<h2>IPv6<\/h2>\r\n<table border=\"1\" cellspacing=\"1\" cellpadding=\"2\" bgcolor=\"#EEEEEE\">\r\n<thead>\r\n<tr>\r\n<td>\r\n<p align=\"center\"><strong>Prefix<\/strong><\/p>\r\n<\/td>\r\n<td>\r\n<p align=\"center\"><strong>\/48s<\/strong><\/p>\r\n<\/td>\r\n<td>\r\n<p align=\"center\"><strong>\/56s<\/strong><\/p>\r\n<\/td>\r\n<td>\r\n<p align=\"center\"><strong>\/64s<\/strong><\/p>\r\n<\/td>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td>\/24<\/td>\r\n<td>16M<\/td>\r\n<td>4G<\/td>\r\n<td>1T<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/25<\/td>\r\n<td>8M<\/td>\r\n<td>2G<\/td>\r\n<td>512G<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/26<\/td>\r\n<td>4M<\/td>\r\n<td>1G<\/td>\r\n<td>256G<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/27<\/td>\r\n<td>2M<\/td>\r\n<td>512M<\/td>\r\n<td>128G<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/28<\/td>\r\n<td>1M<\/td>\r\n<td>256M<\/td>\r\n<td>64G<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/29<\/td>\r\n<td>512K<\/td>\r\n<td>128M<\/td>\r\n<td>32G<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/30<\/td>\r\n<td>256K<\/td>\r\n<td>64M<\/td>\r\n<td>16G<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/31<\/td>\r\n<td>128K<\/td>\r\n<td>32M<\/td>\r\n<td>8G<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/32<\/td>\r\n<td>64K<\/td>\r\n<td>16M<\/td>\r\n<td>4G<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/33<\/td>\r\n<td>32K<\/td>\r\n<td>8M<\/td>\r\n<td>2G<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/34<\/td>\r\n<td>16K<\/td>\r\n<td>4M<\/td>\r\n<td>1G<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/35<\/td>\r\n<td>8K<\/td>\r\n<td>2M<\/td>\r\n<td>512M<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/36<\/td>\r\n<td>4K<\/td>\r\n<td>1M<\/td>\r\n<td>256M<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/37<\/td>\r\n<td>2K<\/td>\r\n<td>512K<\/td>\r\n<td>128M<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/38<\/td>\r\n<td>1K<\/td>\r\n<td>256K<\/td>\r\n<td>64M<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/39<\/td>\r\n<td>512<\/td>\r\n<td>128K<\/td>\r\n<td>32M<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/40<\/td>\r\n<td>256<\/td>\r\n<td>64K<\/td>\r\n<td>16M<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/41<\/td>\r\n<td>128<\/td>\r\n<td>32K<\/td>\r\n<td>8M<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/42<\/td>\r\n<td>64<\/td>\r\n<td>16K<\/td>\r\n<td>4M<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/43<\/td>\r\n<td>32<\/td>\r\n<td>8K<\/td>\r\n<td>2M<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/44<\/td>\r\n<td>16<\/td>\r\n<td>4K<\/td>\r\n<td>1M<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/45<\/td>\r\n<td>8<\/td>\r\n<td>2K<\/td>\r\n<td>512K<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/46<\/td>\r\n<td>4<\/td>\r\n<td>1K<\/td>\r\n<td>256K<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/47<\/td>\r\n<td>2<\/td>\r\n<td>512<\/td>\r\n<td>128K<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/48<\/td>\r\n<td>1<\/td>\r\n<td>256<\/td>\r\n<td>64K<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/49<\/td>\r\n<td><\/td>\r\n<td>128<\/td>\r\n<td>32K<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/50<\/td>\r\n<td><\/td>\r\n<td>64<\/td>\r\n<td>16K<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/51<\/td>\r\n<td><\/td>\r\n<td>32<\/td>\r\n<td>8K<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/52<\/td>\r\n<td><\/td>\r\n<td>16<\/td>\r\n<td>4K<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/53<\/td>\r\n<td><\/td>\r\n<td>8<\/td>\r\n<td>2K<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/54<\/td>\r\n<td><\/td>\r\n<td>4<\/td>\r\n<td>1K<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/55<\/td>\r\n<td><\/td>\r\n<td>2<\/td>\r\n<td>512<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/56<\/td>\r\n<td><\/td>\r\n<td>1<\/td>\r\n<td>256<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/57<\/td>\r\n<td><\/td>\r\n<td><\/td>\r\n<td>128<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/58<\/td>\r\n<td><\/td>\r\n<td><\/td>\r\n<td>64<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/59<\/td>\r\n<td><\/td>\r\n<td><\/td>\r\n<td>32<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/60<\/td>\r\n<td><\/td>\r\n<td><\/td>\r\n<td>16<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/61<\/td>\r\n<td><\/td>\r\n<td><\/td>\r\n<td>8<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/62<\/td>\r\n<td><\/td>\r\n<td><\/td>\r\n<td>4<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/63<\/td>\r\n<td><\/td>\r\n<td><\/td>\r\n<td>2<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>\/64<\/td>\r\n<td><\/td>\r\n<td><\/td>\r\n<td>1<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<h2>IPv6 bit mapping<\/h2>\r\n<picture><source srcset=\"https:\/\/subnettingpractice.com\/wp-content\/uploads\/IPv6-Bit-Mapping-684x1024.avif 684w,https:\/\/subnettingpractice.com\/wp-content\/uploads\/IPv6-Bit-Mapping-201x300.avif 201w,https:\/\/subnettingpractice.com\/wp-content\/uploads\/IPv6-Bit-Mapping-768x1149.avif 768w,https:\/\/subnettingpractice.com\/wp-content\/uploads\/IPv6-Bit-Mapping.avif 905w\" sizes=\"(max-width: 684px) 100vw, 684px\" type=\"image\/avif\"><source srcset=\"https:\/\/subnettingpractice.com\/wp-content\/uploads\/IPv6-Bit-Mapping-684x1024.webp 684w,https:\/\/subnettingpractice.com\/wp-content\/uploads\/IPv6-Bit-Mapping-201x300.webp 201w,https:\/\/subnettingpractice.com\/wp-content\/uploads\/IPv6-Bit-Mapping-768x1149.webp 768w,https:\/\/subnettingpractice.com\/wp-content\/uploads\/IPv6-Bit-Mapping.webp 905w\" sizes=\"(max-width: 684px) 100vw, 684px\" type=\"image\/webp\"><img src=\"https:\/\/subnettingpractice.com\/wp-content\/uploads\/IPv6-Bit-Mapping-684x1024.jpg\" height=\"1024\" width=\"684\" srcset=\"https:\/\/subnettingpractice.com\/wp-content\/uploads\/IPv6-Bit-Mapping-684x1024.jpg 684w, https:\/\/subnettingpractice.com\/wp-content\/uploads\/IPv6-Bit-Mapping-201x300.jpg 201w, https:\/\/subnettingpractice.com\/wp-content\/uploads\/IPv6-Bit-Mapping-768x1149.jpg 768w, https:\/\/subnettingpractice.com\/wp-content\/uploads\/IPv6-Bit-Mapping.jpg 905w\" sizes=\"(max-width: 684px) 100vw, 684px\" class=\"alignnone wp-image-298 size-large sp-no-webp\" alt=\"IPv6 Bit Mapping\" loading=\"lazy\" decoding=\"async\"  > <\/picture>\r\n<h2>Binary<\/h2>\r\n<table border=\"1\" cellspacing=\"1\" cellpadding=\"2\" bgcolor=\"#EEEEEE\">\r\n<tbody>\r\n<tr>\r\n<td>Bit<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<td>1<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Bit Value<\/td>\r\n<td>128<\/td>\r\n<td>64<\/td>\r\n<td>32<\/td>\r\n<td>16<\/td>\r\n<td>8<\/td>\r\n<td>4<\/td>\r\n<td>2<\/td>\r\n<td>1<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n\r\n<a href=\"\/wp-content\/themes\/generatepress-child\/images\/IPv4_cheat_sheet.png\"><img loading=\"lazy\" decoding=\"async\" src=\"\/wp-content\/themes\/generatepress-child\/images\/IPv4_cheat_sheet.png\" alt=\"IPv4 Subnetting Cheat Sheet\" width=\"340\" height=\"400\" \/><\/a>\r\n<a href=\"\/wp-content\/themes\/generatepress-child\/images\/ipv6_cheat_sheet.png\"><img loading=\"lazy\" decoding=\"async\" src=\"\/wp-content\/themes\/generatepress-child\/images\/ipv6_cheat_sheet.png\" alt=\"IPv6 Subnetting Cheat Sheet\" width=\"340\" height=\"400\" \/><\/a>\r\n\r\n<a href=\"\/wp-content\/themes\/generatepress-child\/images\/OSI_layer_cheat_sheet.png\"><img loading=\"lazy\" decoding=\"async\" src=\"\/wp-content\/themes\/generatepress-child\/images\/OSI_layer_cheat_sheet.png\" alt=\"OSI, TCP\/IP layer Cheat Sheet\" width=\"580\" height=\"360\" \/><\/a>\r\n\r\n<p>Learning <a href=\"\/how-to-subnet.html\">how to subnet<\/a> is key to passing the CCNA, understanding how the internet works and the basis for any networking career.<\/p>\r\n<p>You can practice with our <a href=\"\/\">IPv4 subnetting practice<\/a> and <a href='\/ipv6-subnetting-practice.html'>IPv6 subnetting practice<\/a> questions<\/p>\r\n<p>You can verify your answers with our <a href='\/subnet-calculator.html'>Subnet Calculator<\/a> or <a href='\/vlsm.html'>VLSM Calculator<\/a>.\r\n\r\n<hr \/>\r\n\r\n<p>If you want to learn more about networking and get the Cisco CCNA certification, we highly recommend the Cisco CCNA Gold Bootcamp as your <a href=\"https:\/\/www.flackbox.com\/cisco-ccna-gold-bootcamp-li#sp2\"><strong>CCNA training course<\/strong><\/a>. The CCNA is by far the most in-demand networking certification by employers, and the Gold Bootcamp is the highest rated Cisco course online. It has an average rating of 4.8 from over 30,000 public reviews:<\/p>\r\n\r\n<div class=\"su-spacer\" style=\"height:20px\"><\/div>\r\n\r\n<p><a href=\"https:\/\/www.flackbox.com\/cisco-ccna-gold-bootcamp-li#sp2\" rel=\"nofollow sponsored\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2436\" src=\"https:\/\/subnettingpractice.com\/wp-content\/uploads\/CCNA-Banner-Highest-Rated.webp\" alt=\"Cisco CCNA Gold Bootcamp training course\" width=\"682\" height=\"136\" \/><\/a><\/p>","protected":false},"excerpt":{"rendered":"Download our complete Subnet Cheat Sheet PDF: The PDF will be delivered to your email inbox. We won&#8217;t send you any spam. Unsubscribe at any time. IPv4 Subnet Cheat Sheet CIDR Subnet Mask Total IPs Usable IPs \/32 255.255.255.255 1 1 \/31 255.255.255.254 2 2* \/30 255.255.255.252 4 2 \/29 255.255.255.248 8 6 \/28 255.255.255.240 &#8230; <a title=\"Subnet Cheat Sheet\" class=\"read-more\" href=\"https:\/\/subnettingpractice.com\/subnet-cheat-sheet.html\" aria-label=\"Read more about Subnet Cheat Sheet\">Read more<\/a>","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":23,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Subnet Cheat Sheet - subnettingpractice.com<\/title>\n<meta name=\"description\" content=\"A complete subnetting reference cheat sheet. Includes both IPv4 and IPv6 along with binary. 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