CIDR Notation
From IVS Wiki
| Subnet Mask
|
CIDR Prefix
|
Total IP Addresses
|
Usable IP Addresses
|
Number of /24 networks
|
| 255.255.255.255
|
32
|
1
|
1
|
1/256th
|
| 255.255.255.254
|
31
|
2
|
2*
|
1/128th
|
| 255.255.255.252
|
30
|
4
|
2
|
1/64th
|
| 255.255.255.248
|
29
|
8
|
6
|
1/32nd
|
| 255.255.255.240
|
28
|
16
|
14
|
1/16th
|
| 255.255.255.224
|
27
|
32
|
30
|
1/8th
|
| 255.255.255.192
|
26
|
64
|
62
|
1/4th
|
| 255.255.255.128
|
25
|
128
|
126
|
1 half
|
| 255.255.255.0
|
24
|
256
|
254
|
1
|
| 255.255.254.0
|
23
|
512
|
510
|
2
|
| 255.255.252.0
|
22
|
1024
|
1022
|
4
|
| 255.255.248.0
|
21
|
2048
|
2046
|
8
|
| 255.255.240.0
|
20
|
4096
|
4094
|
16
|
| 255.255.224.0
|
19
|
8192
|
8190
|
32
|
| 255.255.192.0
|
18
|
16,384
|
16,382
|
64
|
| 255.255.128.0
|
17
|
32,768
|
32,766
|
128
|
| 255.255.0.0
|
16
|
65,536
|
65,534
|
256
|
