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You are here: Encyclopedia > CIDR Network Information
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CIDR Network Information
This information is pretty common on the Interweb. I just reformatted the basic information into a wiki friendly table.
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Netmask
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Reverse Netmask
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IPs
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Class Cs
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Class Bs
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Class As
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/32
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255.255.255.255
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0.0.0.0
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1
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/31
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255.255.255.254
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0.0.0.1
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2
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/30
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255.255.255.252
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0.0.0.3
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4
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/29
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255.255.255.248
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0.0.0.7
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8
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/28
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255.255.255.240
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0.0.0.15
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16
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/27
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255.255.255.224
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0.0.0.31
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32
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/26
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255.255.255.192
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0.0.0.63
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64
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/25
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255.255.255.128
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0.0.0.127
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128
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/24
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255.255.255.0
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0.0.0.255
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256
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1
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/23
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255.255.254.0
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0.0.1.255
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512
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2
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/22
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255.255.252.0
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0.0.3.255
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1024
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4
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/21
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255.255.248.0
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0.0.7.255
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2,048
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8
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/20
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255.255.240.0
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0.0.15.255
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4,096
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16
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/19
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255.255.224.0
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0.0.31.255
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8,192
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32
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/18
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255.255.192.0
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0.0.63.255
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16,384
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64
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/17
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255.255.128.0
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0.0.127.255
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32,768
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128
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/16
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255.255.0.0
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0.0.255.255
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65,536
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256
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1
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/15
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255.254.0.0
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0.1.255.255
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131,072
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512
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2
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/14
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255.252.0.0
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0.3.255.255
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262,144
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1,024
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4
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/13
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255.248.0.0
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0.7.255.255
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524,288
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2,048
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8
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/12
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255.240.0.0
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0.15.255.255
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1,048,576
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4,096
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16
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/11
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255.224.0.0
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0.31.255.255
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2,097,152
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8,192
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32
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/10
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255.192.0.0
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0.63.255.255
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4,194,304
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16,384
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64
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/9
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255.128.0.0
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0.127.255.255
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8,388,608
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32,768
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128
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/8
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255.0.0.0
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0.255.255.255
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16,777,216
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65,536
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256
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1
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/7
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254.0.0.0
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1.255.255.255
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33,554,432
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131,072
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512
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2
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/6
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252.0.0.0
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3.255.255.255
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67,108,864
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262,144
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1,024
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4
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/5
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248.0.0.0
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7.255.255.255
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134,217,728
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524,288
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2,048
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8
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/4
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240.0.0.0
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15.255.255.255
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268,435,456
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1,048,576
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4,096
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16
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/3
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224.0.0.0
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31.255.255.255
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536,870,912
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2,097,152
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8,192
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32
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/2
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192.0.0.0
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63.255.255.255
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1,073,741,824
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4,194,304
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16,384
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64
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/1
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128.0.0.0
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127.255.255.255
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2,147,483,648
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8,388,608
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32,768
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128
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/0
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0.0.0.0
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255.255.255.255
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4,294,967,296
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16,777,216
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65,536
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256
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