CIDR Conversion Table
|
CIDR prefix length
|
Dotted Decimal Netmask
|
Hexidecimal Netmask
|
Inverse Netmask
|
Binary
|
Number of Classfull Networks
|
Number of Usable IPs
|
|
|
| /1 |
128.0.0.0 |
80 00 00 00 |
127.255.255.255 |
1000 0000 0000 0000 0000 0000 0000 0000 |
128 As |
2,147,483,646 |
|
| /2 |
192.0.0.0 |
C0 00 00 00 |
63.255.255.255 |
1100 0000 0000 0000 0000 0000 0000 0000 |
64 As |
1,073,741,822 |
|
| /3 |
224.0.0.0 |
E0 00 00 00 |
31.255.255.255 |
1110 0000 0000 0000 0000 0000 0000 0000 |
32 As |
536,870,910 |
|
| /4 |
240.0.0.0 |
F0 00 00 00 |
15.255.255.255 |
1111 0000 0000 0000 0000 0000 0000 0000 |
16 As |
268,435,454 |
|
| /5 |
248.0.0.0 |
F8 00 00 00 |
7.255.255.255 |
1111 1000 0000 0000 0000 0000 0000 0000 |
8 As |
134,217,726 |
|
| /6 |
252.0.0.0 |
FC 00 00 00 |
3.255.255.255 |
1111 1100 0000 0000 0000 0000 0000 0000 |
4 As |
67,108,862 |
|
| /7 |
254.0.0.0 |
FE 00 00 00 |
1.255.255.255 |
1111 1110 0000 0000 0000 0000 0000 0000 |
2 As |
33,554,430 |
|
| /8 |
255.0.0.0 |
FF 00 00 00 |
0.255.255.255 |
1111 1111 0000 0000 0000 0000 0000 0000 |
1 A or 256 Bs |
16,777,214 |
|
|
| /9 |
255.128.0.0 |
FF 80 00 00 |
0.127.255.255 |
1111 1111 1000 0000 0000 0000 0000 0000 |
128 Bs |
8,388,606 |
|
| /10 |
255.192.0.0 |
FF C0 00 00 |
0.63.255.255 |
1111 1111 1100 0000 0000 0000 0000 0000 |
64 Bs |
4,194,302 |
|
| /11 |
255.224.0.0 |
FF E0 00 00 |
0.31.255.255 |
1111 1111 1110 0000 0000 0000 0000 0000 |
32 Bs |
2,097,150 |
|
| /12 |
255.240.0.0 |
FF F0 00 00 |
0.15.255.255 |
1111 1111 1111 0000 0000 0000 0000 0000 |
16 Bs |
1,048,574 |
|
| /13 |
255.248.0.0 |
FF F8 00 00 |
0.7.255.255 |
1111 1111 1111 1000 0000 0000 0000 0000 |
8 Bs |
524,286 |
|
| /14 |
255.252.0.0 |
FF FC 00 00 |
0.3.255.255 |
1111 1111 1111 1100 0000 0000 0000 0000 |
4 Bs |
262,142 |
|
| /15 |
255.254.0.0 |
FF FE 00 00 |
0.1.255.255 |
1111 1111 1111 1110 0000 0000 0000 0000 |
2 Bs |
131,070 |
|
| /16 |
255.255.0.0 |
FF FF 00 00 |
0.0.255.255 |
1111 1111 1111 1111 0000 0000 0000 0000 |
1 B or 256 Cs |
65,534 |
|
|
| /17 |
255.255.128.0 |
FF FF 80 00 |
0.0.127.255 |
1111 1111 1111 1111 1000 0000 0000 0000 |
128 Cs |
32,766 |
|
| /18 |
255.255.192.0 |
FF FF C0 00 |
0.0.63.255 |
1111 1111 1111 1111 1100 0000 0000 0000 |
64 Cs |
16,382 |
|
| /19 |
255.255.224.0 |
FF FF E0 00 |
0.0.31.255 |
1111 1111 1111 1111 1110 0000 0000 0000 |
32 Cs |
8,190 |
|
| /20 |
255.255.240.0 |
FF FF F0 00 |
0.0.15.255 |
1111 1111 1111 1111 1111 0000 0000 0000 |
16 Cs |
4,094 |
|
| /21 |
255.255.248.0 |
FF FF F8 00 |
0.0.7.255 |
1111 1111 1111 1111 1111 1000 0000 0000 |
8 Cs |
2,046 |
|
| /22 |
255.255.252.0 |
FF FF FC 00 |
0.0.3.255 |
1111 1111 1111 1111 1111 1100 0000 0000 |
4 Cs |
1,022 |
|
| /23 |
255.255.254.0 |
FF FF FE 00 |
0.0.1.255 |
1111 1111 1111 1111 1111 1110 0000 0000 |
2 Cs |
510 |
|
| /24 |
255.255.255.0 |
FF FF FF 00 |
0.0.0.255 |
1111 1111 1111 1111 1111 1111 0000 0000 |
1 C |
254 |
|
|
| /25 |
255.255.255.128 |
FF FF FF 80 |
0.0.0.127 |
1111 1111 1111 1111 1111 1111 1000 0000 |
1/2 C |
126 |
|
| /26 |
255.255.255.192 |
FF FF FF C0 |
0.0.0.63 |
1111 1111 1111 1111 1111 1111 1100 0000 |
1/4 C |
62 |
|
| /27 |
255.255.255.224 |
FF FF FF E0 |
0.0.0.31 |
1111 1111 1111 1111 1111 1111 1110 0000 |
1/8 C |
30 |
|
| /28 |
255.255.255.240 |
FF FF FF F0 |
0.0.0.15 |
1111 1111 1111 1111 1111 1111 1111 0000 |
1/16 C |
14 |
|
| /29 |
255.255.255.248 |
FF FF FF F8 |
0.0.0.7 |
1111 1111 1111 1111 1111 1111 1111 1000 |
1/32 C |
6 |
|
| /30 |
255.255.255.252 |
FF FF FF FC |
0.0.0.3 |
1111 1111 1111 1111 1111 1111 1111 1100 |
1/64 C |
2 |
|
| /31 |
255.255.255.254 |
FF FF FF FE |
0.0.0.1 |
1111 1111 1111 1111 1111 1111 1111 1110 |
1/128 C |
0 |
|
| /32 |
255.255.255.255 |
FF FF FF FF |
0.0.0.0 |
1111 1111 1111 1111 1111 1111 1111 1111 |
1/256 C |
1 |