CLASSLESS INTER DOMAIN ROUTING(CIDR)
CIDR is the method that ISP(Internet Service Provider) use to allot the IP Address to companies or Home or College or Customer .They provide in a certain block size
when you recieve address from Internet service Provider that will get like this 192.168.10.32/28
For Example This will be telling you what the subnet mask is?
128 | 1 0 0 0 0 0 0 0 (i.e. 1 Bit ON and 7 OFF)
192 | 1 1 0 0 0 0 0 0 (i.e. 2 Bits ON and 6 OFF)
224 | 1 1 1 0 0 0 0 0 (i.e. 3 Bits ON and 5 OFF)
240 | 1 1 1 1 0 0 0 0 (i.e. 4 Bits ON and 4 OFF)
248 | 1 1 1 1 1 0 0 0 (i.e. 5 Bits ON and 3 OFF)
252 | 1 1 1 1 1 1 0 0 (i.e. 6 Bits ON and 2 OFF)
254 | 1 1 1 1 1 1 1 0 (i.e. 7 Bits ON and 1 OFF)
255 | 1 1 1 1 1 1 1 1 (i.e. 8 Bits ON and 0 OFF)
Subnet Mask CIDR Value
CLASS A
255.0.0.0 /8
255.128.0.0 /9
255.192.0.0 /10
255.224.0.0 /11
255.240.0.0 /12
255.248.0.0 /13
255.252.0.0 /14
255.254.0.0 /15
CLASS B
255.255.0.0 /16
255.255.128.0 /17
255.255.192.0 /18
255.255.224.0 /19
255.255.240.0 /20
255.255.248.0 /21
255.255.252.0 /22
255.255.254.0 /23
CLASS C
255.255.255.0 /24
255.255.255.128 /25
255.255.255.192 /26
255.255.255.224 /27
255.255.255.240 /28
255.255.255.248 /29
255.255.255.252 /30
255.255.255.254 /31
255.255.255.255 /32
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