CIDR: Difference between revisions
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(Created page with "{{header}} CIDR is short for 'Classless Internet Domain Routing'. The Wikipedia article below does a great job at explaining CIDR in detail. For most cases, however, CIDR [[...") |
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Conversion table: | Conversion table: | ||
{|class="wikitable | {|class="wikitable" | ||
!CIDR Notation | !CIDR Notation | ||
!Network Mask | !Network Mask | ||
!Total number | |||
of addresses | |||
!Description | !Description | ||
|- | |- | ||
|class="code"|/0 | |class="code"|/0 | ||
|class="code"|0.0.0.0 | |||
|class="code"|4,294,967,296 | |class="code"|4,294,967,296 | ||
|Every Address | |Every Address | ||
|- | |- | ||
|class="code"|/1 | |class="code"|/1 | ||
|class="code"|128.0.0.0 | |||
|class="code"|2,147,483,648 | |class="code"|2,147,483,648 | ||
|128 <span class="code">/8</span> networks | |128 <span class="code">/8</span> networks | ||
|- | |- | ||
|class="code"|/2 | |class="code"|/2 | ||
|class="code"|192.0.0.0 | |||
|class="code"|1,073,741,824 | |class="code"|1,073,741,824 | ||
|64 <span class="code">/8</span> networks | |64 <span class="code">/8</span> networks | ||
|- | |- | ||
|class="code"|/3 | |class="code"|/3 | ||
|class="code"|224.0.0.0 | |||
|class="code"|536,870,912 | |class="code"|536,870,912 | ||
|32 <span class="code">/8</span> networks | |32 <span class="code">/8</span> networks | ||
|- | |- | ||
|class="code"|/4 | |class="code"|/4 | ||
|class="code"|240.0.0.0 | |||
|class="code"|268,435,456 | |class="code"|268,435,456 | ||
|16 <span class="code">/8</span> networks | |16 <span class="code">/8</span> networks | ||
|- | |- | ||
|class="code"|/5 | |class="code"|/5 | ||
|class="code"|248.0.0.0 | |||
|class="code"|134,217,728 | |class="code"|134,217,728 | ||
|8 <span class="code">/8</span> networks | |8 <span class="code">/8</span> networks | ||
|- | |- | ||
|class="code"|/6 | |class="code"|/6 | ||
|class="code"|252.0.0.0 | |||
|class="code"|67,108,864 | |class="code"|67,108,864 | ||
|4 <span class="code">/8</span> networks | |4 <span class="code">/8</span> networks | ||
|- | |- | ||
|class="code"|/7 | |class="code"|/7 | ||
|class="code"|254.0.0.0 | |||
|class="code"|33,554,432 | |class="code"|33,554,432 | ||
|2 <span class="code">/8</span> networks | |2 <span class="code">/8</span> networks | ||
|- | |- | ||
|class="code"|/8 | |class="code"|/8 | ||
|class="code"|255.0.0.0 | |||
|class="code"|16,777,214 | |class="code"|16,777,214 | ||
|1 <span class="code">/8</span> net | |1 <span class="code">/8</span> net | ||
|- | |- | ||
|class="code"|/9 | |class="code"|/9 | ||
|class="code"|255.128.0.0 | |||
|class="code"|8,388,608 | |class="code"|8,388,608 | ||
|128 <span class="code">/16</span> networks | |128 <span class="code">/16</span> networks | ||
|- | |- | ||
|class="code"|/10 | |class="code"|/10 | ||
|class="code"|255.192.0.0 | |||
|class="code"|4,194,304 | |class="code"|4,194,304 | ||
|64 <span class="code">/16</span> networks | |64 <span class="code">/16</span> networks | ||
|- | |- | ||
|class="code"|/11 | |class="code"|/11 | ||
|class="code"|255.224.0.0 | |||
|class="code"|2,097,152 | |class="code"|2,097,152 | ||
|32 <span class="code">/16</span> networks | |32 <span class="code">/16</span> networks | ||
|- | |- | ||
|class="code"|/12 | |class="code"|/12 | ||
|class="code"|255.240.0.0 | |||
|class="code"|1,048,576 | |class="code"|1,048,576 | ||
|16 <span class="code">/16</span> networks | |16 <span class="code">/16</span> networks | ||
|- | |- | ||
|class="code"|/13 | |class="code"|/13 | ||
|class="code"|255.248.0.0 | |||
|class="code"|524,288 | |class="code"|524,288 | ||
|8 <span class="code">/16</span> networks | |8 <span class="code">/16</span> networks | ||
|- | |- | ||
|class="code"|/14 | |class="code"|/14 | ||
|class="code"|255.252.0.0 | |||
|class="code"|262,144 | |class="code"|262,144 | ||
|4 <span class="code">/16</span> networks | |4 <span class="code">/16</span> networks | ||
|- | |- | ||
|class="code"|/15 | |class="code"|/15 | ||
|class="code"|255.254.0.0 | |class="code"|255.254.0.0 | ||
|class="code"|131,072 | |||
|2 <span class="code">/16</span> networks | |2 <span class="code">/16</span> networks | ||
|- | |- | ||
|class="code"|/16 | |class="code"|/16 | ||
|class="code"|255.255.0.0 | |||
|class="code"|65,536 | |class="code"|65,536 | ||
|1 <span class="code">/16</span> network | |1 <span class="code">/16</span> network | ||
|- | |- | ||
|class="code"|/17 | |class="code"|/17 | ||
|class="code"|255.255.128.0 | |||
|class="code"|32,768 | |class="code"|32,768 | ||
|128 <span class="code">/24</span> networks | |128 <span class="code">/24</span> networks | ||
|- | |- | ||
|class="code"|/18 | |class="code"|/18 | ||
|class="code"|255.255.192.0 | |||
|class="code"|16,384 | |class="code"|16,384 | ||
|64 <span class="code">/24</span> networks | |64 <span class="code">/24</span> networks | ||
|- | |- | ||
|class="code"|/19 | |class="code"|/19 | ||
|class="code"|255.255.224.0 | |||
|class="code"|8,192 | |class="code"|8,192 | ||
|32 <span class="code">/24</span> networks | |32 <span class="code">/24</span> networks | ||
|- | |- | ||
|class="code"|/20 | |class="code"|/20 | ||
|class="code"|255.255.240.0 | |||
|class="code"|4,096 | |class="code"|4,096 | ||
|16 <span class="code">/24</span> networks | |16 <span class="code">/24</span> networks | ||
|- | |- | ||
|class="code"|/21 | |class="code"|/21 | ||
|class="code"|255.255.248.0 | |||
|class="code"|2,048 | |class="code"|2,048 | ||
|8 <span class="code">/24</span> networks | |8 <span class="code">/24</span> networks | ||
|- | |- | ||
|class="code"|/22 | |class="code"|/22 | ||
|class="code"|255.255.252.0 | |||
|class="code"|1,024 | |class="code"|1,024 | ||
|4 <span class="code">/24</span> networks | |4 <span class="code">/24</span> networks | ||
|- | |- | ||
|class="code"|/23 | |class="code"|/23 | ||
|class="code"|255.255.254.0 | |||
|class="code"|512 | |class="code"|512 | ||
|2 <span class="code">/24</span> networks | |2 <span class="code">/24</span> networks | ||
|- | |- | ||
|class="code"|/24 | |class="code"|/24 | ||
|class="code"|255.255.255.0 | |||
|class="code"|256 | |class="code"|256 | ||
|1 <span class="code">/24</span> network | |1 <span class="code">/24</span> network | ||
|- | |- | ||
|class="code"|/25 | |class="code"|/25 | ||
|class="code"|255.255.255.128 | |||
|class="code"|128 | |class="code"|128 | ||
|Half of a <span class="code">/24</span> network | |Half of a <span class="code">/24</span> network | ||
|- | |- | ||
|class="code"|/26 | |class="code"|/26 | ||
|class="code"|255.255.255.192 | |||
|class="code"|64 | |class="code"|64 | ||
|Fourth of a <span class="code">/24/span> network | |Fourth of a <span class="code">/24/span> network | ||
|- | |- | ||
|class="code"|/27 | |class="code"|/27 | ||
|class="code"|255.255.255.224 | |||
|class="code"|32 | |class="code"|32 | ||
|Eighth of a <span class="code">/24/span> network | |Eighth of a <span class="code">/24/span> network | ||
|- | |- | ||
|class="code"|/28 | |class="code"|/28 | ||
|class="code"|255.255.255.240 | |||
|class="code"|16 | |class="code"|16 | ||
|1/16th of a <span class="code">/24/span> network | |1/16th of a <span class="code">/24/span> network | ||
|- | |- | ||
|class="code"|/29 | |class="code"|/29 | ||
|class="code"|255.255.255.248 | |||
|class="code"|8 | |class="code"|8 | ||
|5 Usable addresses | |5 Usable addresses | ||
|- | |- | ||
|class="code"|/30 | |class="code"|/30 | ||
|class="code"|255.255.255.252 | |||
|class="code"|4 | |class="code"|4 | ||
|1 Usable address | |1 Usable address | ||
|- | |- | ||
|class="code"|/31 | |class="code"|/31 | ||
|class="code"|255.255.255.254 | |||
|class="code"|2 | |class="code"|2 | ||
|Unusable | |Unusable | ||
|- | |- | ||
|class="code"|/32 | |class="code"|/32 | ||
|class="code"|255.255.255.255 | |||
|class="code"|1 | |class="code"|1 | ||
|Single host | |Single host | ||
|} | |} | ||
Latest revision as of 01:37, 3 October 2014
|
AN!Wiki :: CIDR |
CIDR is short for 'Classless Internet Domain Routing'. The Wikipedia article below does a great job at explaining CIDR in detail.
For most cases, however, CIDR IPv4 notation is used as a short-form way of expressing a subnet mask.
Conversion table:
| CIDR Notation | Network Mask | Total number
of addresses |
Description |
|---|---|---|---|
| /0 | 0.0.0.0 | 4,294,967,296 | Every Address |
| /1 | 128.0.0.0 | 2,147,483,648 | 128 /8 networks |
| /2 | 192.0.0.0 | 1,073,741,824 | 64 /8 networks |
| /3 | 224.0.0.0 | 536,870,912 | 32 /8 networks |
| /4 | 240.0.0.0 | 268,435,456 | 16 /8 networks |
| /5 | 248.0.0.0 | 134,217,728 | 8 /8 networks |
| /6 | 252.0.0.0 | 67,108,864 | 4 /8 networks |
| /7 | 254.0.0.0 | 33,554,432 | 2 /8 networks |
| /8 | 255.0.0.0 | 16,777,214 | 1 /8 net |
| /9 | 255.128.0.0 | 8,388,608 | 128 /16 networks |
| /10 | 255.192.0.0 | 4,194,304 | 64 /16 networks |
| /11 | 255.224.0.0 | 2,097,152 | 32 /16 networks |
| /12 | 255.240.0.0 | 1,048,576 | 16 /16 networks |
| /13 | 255.248.0.0 | 524,288 | 8 /16 networks |
| /14 | 255.252.0.0 | 262,144 | 4 /16 networks |
| /15 | 255.254.0.0 | 131,072 | 2 /16 networks |
| /16 | 255.255.0.0 | 65,536 | 1 /16 network |
| /17 | 255.255.128.0 | 32,768 | 128 /24 networks |
| /18 | 255.255.192.0 | 16,384 | 64 /24 networks |
| /19 | 255.255.224.0 | 8,192 | 32 /24 networks |
| /20 | 255.255.240.0 | 4,096 | 16 /24 networks |
| /21 | 255.255.248.0 | 2,048 | 8 /24 networks |
| /22 | 255.255.252.0 | 1,024 | 4 /24 networks |
| /23 | 255.255.254.0 | 512 | 2 /24 networks |
| /24 | 255.255.255.0 | 256 | 1 /24 network |
| /25 | 255.255.255.128 | 128 | Half of a /24 network |
| /26 | 255.255.255.192 | 64 | Fourth of a /24/span> network |
| /27 | 255.255.255.224 | 32 | Eighth of a /24/span> network |
| /28 | 255.255.255.240 | 16 | 1/16th of a /24/span> network |
| /29 | 255.255.255.248 | 8 | 5 Usable addresses |
| /30 | 255.255.255.252 | 4 | 1 Usable address |
| /31 | 255.255.255.254 | 2 | Unusable |
| /32 | 255.255.255.255 | 1 | Single host |
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