Use this tool to convert CIDR notation to a Subnet Mask.
Select a CIDR
Subnet Mask
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CIDR Lookup Table
|
CIDR Prefix |
Subnet Mask |
Total IP Addresses |
Usable IP Addresses |
|---|---|---|---|
|
/32 |
255.255.255.255 |
1 |
1 |
|
/31 |
255.255.255.254 |
2 |
2* |
|
/30 |
255.255.255.252 |
4 |
2 |
|
/29 |
255.255.255.248 |
8 |
6 |
|
/28 |
255.255.255.240 |
16 |
14 |
|
/27 |
255.255.255.224 |
32 |
30 |
|
/26 |
255.255.255.192 |
64 |
62 |
|
/25 |
255.255.255.128 |
128 |
126 |
|
/24 |
255.255.255.0 |
256 |
254 |
|
/23 |
255.255.254.0 |
512 |
510 |
|
/22 |
255.255.252.0 |
1024 |
1022 |
|
/21 |
255.255.248.0 |
2048 |
2046 |
|
/20 |
255.255.240.0 |
4096 |
4094 |
|
/19 |
255.255.224.0 |
8192 |
8190 |
|
/18 |
255.255.192.0 |
16,384 |
16,382 |
|
/17 |
255.255.128.0 |
32,768 |
32,766 |
|
/16 |
255.255.0.0 |
65,536 |
65,534 |
|
/15 |
255.254.0.0 |
131,072 |
131,070 |
|
/14 |
255.252.0.0 |
262,144 |
262,142 |
|
/13 |
255.248.0.0 |
524,288 |
524,286 |
|
/12 |
255.240.0.0 |
1,048,576 |
1,048,574 |
|
/11 |
255.224.0.0 |
2,097,152 |
2,097,150 |
|
/10 |
255.192.0.0 |
4,194,304 |
4,194,302 |
|
/9 |
255.128.0.0 |
8,388,608 |
8,388,606 |
|
/8 |
255.0.0.0 |
16,777,216 |
16,777,214 |
|
/7 |
254.0.0.0 |
33,554,432 |
33,554,430 |
|
/6 |
252.0.0.0 |
67,108,864 |
67,108,862 |
|
/5 |
248.0.0.0 |
134,217,728 |
134,217,726 |
|
/4 |
240.0.0.0 |
268,435,456 |
268,435,454 |
|
/3 |
224.0.0.0 |
536,870,912 |
536,870,910 |
|
/2 |
192.0.0.0 |
1,073,741,824 |
1,073,741,822 |
|
/1 |
128.0.0.0 |
2,147,483,648 |
2,147,483,646 |
|
/0 |
0.0.0.0 |
4,294,967,296 |
4,294,967,294 |