CIDR - VLSM - Cheet sheet

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VLSM - CIDR - Cheet sheet

VLSM - Variable-length subnet mask
CIDR - Classless Inter-Domain Routing

CIDR
Mask
Block
/9 /17 /25
.128
128
/10 /18 /26
.192
64
/11 /19 /27
.224
32
/12 /20 /28
.240
16
/13 /21 /29
.248
8
/14 /22 /30
.252
4
/15 /23 /31
.254
2
2^x
11
2048
18
262144
12
4096
19
524288
13
8192
20
1048576
14
16384
21
2097152
15
32768
22
4194304
16
65536
23
8388608
17
131072
24
16777216